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annotate doc/Sysmocom-SIM-notes @ 93:6041c601304d

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fcsim1-mkprov: revert OTA key addition It appears that GrcardSIM2 cards (which is what we got for FCSIM1) do not support OTA after all, contrary to what we were previously led to believe by some tech support emails from Grcard - apparently those support emails and OTA descriptions referred to some other card model(s).
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 21 Apr 2021 05:38:39 +0000
parents 6ccc4d952830
children
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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1 The current programmable SIM card model sold by Sysmocom in their webshop
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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2 (sysmoISIM-SJA2) is probably good for people who run their own cellular networks
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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3 of the LTE/5G kind, but it is NOT a good choice for those of us who are only
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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4 interested in GSM/2G, to the exclusion of all later G's:
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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5
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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6 * The triple-cut physical form factor is inferior (compared to solid-piece 2FF
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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7 without 3FF or 4FF cuts) for use in classic GSM/2G phones with 2FF SIM
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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8 sockets.
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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9
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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10 * The presence of unwanted USIM and ISIM applications with their associated
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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11 ADF.USIM and ADF.ISIM file systems is very unpleasant: it forces us to either
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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12 study up on completely unwanted-to-us USIM and ISIM specs and program all
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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13 those files to something sensible (and just what would be sensible programming
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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14 of USIM and ISIM files for a 2G-only network that exists solely to provide
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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15 service to classic GSM/2G phones?), plus expend oodles of time and effort to
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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16 develop the necessary programming tools that can write all those files under
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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17 ADF.USIM and ADF.ISIM, or leave all those files unprogrammed, and take a
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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18 gamble if someone sticks the partially-programmed card (classic SIM
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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19 programmed, USIM and ISIM left unprogrammed) into a phone that knows about
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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20 USIM and/or ISIM.
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22 * Some of the advertising which Sysmocom prints on their current webshop cards,
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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23 plus the very name sysmoISIM (emphasizing and glorifying ISIM rather than
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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24 plain SIM) is offensive at least to me (Mother Mychaela), and should be
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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25 offensive to any truly devoted lover of classic GSM/2G technology.
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Mychaela Falconia <falcon@freecalypso.org>
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27 Because of the above considerations, we (FreeCalypso) are currently in the
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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28 process of getting our own community SIMs made, to serve as an alternative to
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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29 Sysmocom webshop product. Our FreeCalypso community SIMs are currently as of
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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30 this writing (2021-03) being made for us by Grcard in China, they are a GSM-only
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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31 SIM card model (GrcardSIM2) without USIM/ISIM (they don't speak UICC protocol
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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32 at all, yay!), and we are having them made in a 2FF-only cut, meaning that the
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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33 2FF piece is fully solid.
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35 However, despite our general dislike of Sysmocom's current USIM/ISIM-centric
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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36 product and our ongoing effort to produce a GSM/2G-centric alternative, we do
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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37 have some support in FC SIM tools for Sysmocom's current sysmoISIM-SJA2 card
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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38 and for their previous sysmoUSIM-SJS1 model. This limited support exists
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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39 because these webshop cards are very readily and inexpensively available, and
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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40 because of natural human curiosity - we've been playing with these readily
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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41 available Sysmocom webshop cards while enduring the long delays involved in our
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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42 Grcard-based quest for a better alternative.
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parents: 18
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43
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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44 Sysmocom webshop card database
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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45 ==============================
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47 Whenever you buy a 10-pack of sysmoUSIM-SJS1 or sysmoISIM-SJA2 cards from
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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48 Sysmocom webshop, they send you an email with per-card identities and keys.
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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49 The information in that email is essential for doing any kind of admin writes
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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50 to the cards (the necessary ADM1 key is randomly assigned per card), and also
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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51 for any CHV2 operations: the randomly assigned PIN1 and PUK1 are printed on the
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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52 plastic, but not PIN2 or PUK2, which are also randomly assigned.
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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54 To reduce the need for manual lookups in email data, we have implemented a tool
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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55 that converts Sysmocom webshop emails into our own database format, and we have
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Mychaela Falconia <falcon@freecalypso.org>
parents: 56
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56 integrated support for this database into fc-simtool and fc-uicc-tool.
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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58 Sysmocom webshop emails with USIM/ISIM card key material feature a MIME
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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59 multipart/alternative structure with text/plain and text/html parts, with each
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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60 part further encoded in base64. To extract the bits of interest and convert
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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61 them into our sws-card-db format, follow these steps:
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63 1) Extract the text/plain portion from the MIME structure and decode it from
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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64 base64.
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65
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66 2) Open the extracted and decoded text/plain email portion in your favourite
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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67 text editor and find the heading block of 19 lines, beginning with a line
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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68 that reads "IMSI" and ending with a line that reads "KIK3". (If you bought
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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69 the cheaper option without ADM and OTA keys, there will only be 9 lines here,
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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70 starting with IMSI and ending with OPC.) Then there should be a blank line,
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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71 followed by 19 lines of data per card (or 9 lines for sans-ADM/OTA variant),
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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72 with blank lines separating each card data block from the next. Extract the
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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73 portion beginning with the heading block and ending with the last card data
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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74 block in the batch.
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75
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76 3) Feed the data extract from the previous step to our sws-email2db utility.
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78 sms-email2db sends its output to stdout, thus you should run it like this
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80 sws-email2db email_extract.txt >> /opt/freecalypso/sim-data/sws-card-db
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parents: 18
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81
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Mychaela Falconia <falcon@freecalypso.org>
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82 If you have bought multiple card batches from Sysmocom over the years, you will
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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83 need to collect those old emails and repeat the extraction procedure for each of
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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84 them, using the '>>' form of output redirection to gather all data in one
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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85 sws-card-db file. Edit the finished database file with vi if necessary.
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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86
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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87 Using fc-simtool to program Sysmocom webshop cards
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88 ==================================================
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89
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90 Even though it is a UICC-native card that clearly prefers being admin-programmed
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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91 via the UICC protocol, sysmoISIM-SJA2 allows its ADM1 PIN to be entered in a
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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92 GSM 11.11 SIM protocol session with a VERIFY CHV command with P2=0x0A.
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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93 Therefore, the command to enter sysmoISIM-SJA2 ADM1 manually in fc-simtool is:
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94
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95 verify-ext 10 xxxxxxxx
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96
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97 Unlike the situation with sysmoUSIM-SJS1 (see below), there are no restrictions
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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98 as to when this command may be given in an fc-simtool session.
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parents: 18
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99
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100 The above is the manual command, requiring the operator to manually look up the
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Mychaela Falconia <falcon@freecalypso.org>
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101 correct ADM1 key for the card being programmed. However, if you have your
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
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102 sws-card-db file initialized with data from email per above instructions, you
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Mychaela Falconia <falcon@freecalypso.org>
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103 can authenticate with ADM1 as simply as:
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
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104
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105 sws-auth-adm1
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106
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107 This command reads the ICCID record from the card (totally immutable on SJA2
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Mychaela Falconia <falcon@freecalypso.org>
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108 cards, and always readable without depending on CHV1 status), looks up this
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109 ICCID in sws-card-db, and sends a VERIFY CHV P2=0x0A command to the card with
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
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110 ADM1 extracted from the card db record.
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111
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112 The following additional commands are available that work in a similar manner:
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113
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114 sws-auth-pin1 -- send VERIFY CHV1 with PIN1 from sws-card-db
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115 sws-auth-pin2 -- send VERIFY CHV2 with PIN2 from sws-card-db
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116 sws-pin1-disable -- send DISABLE CHV with PIN1 from sws-card-db
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117 sws-pin1-enable -- send ENABLE CHV with PIN1 from sws-card-db
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118
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119 There is also a generic sws-lookup command that looks up arbitrary sws-card-db
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120 fields for the current card - examples:
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121
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122 sws-lookup puk1 -- look up and display PUK1 for this card
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123 sws-lookup ki opc -- look up and display Ki and OPc for this card
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diff changeset
124
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125 sysmoUSIM-SJS1 difference
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126 =========================
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127
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128 Both sysmoUSIM-SJS1 and sysmoISIM-SJA2 are UICC-native cards, and both really
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129 prefer to be admin-programmed via the UICC protocol, rather than GSM 11.11 SIM
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130 protocol. Both cards do allow ADM1 authentication to be performed in a GSM
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131 11.11 SIM protocol session, but sysmoUSIM-SJS1 is less "happy" about it, and
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132 imposes a more burdensome restriction. sysmoISIM-SJA2 allows its ADM1 key to
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133 be submitted via a VERIFY CHV (CLA=A0, P2=0A) APDU in a GSM 11.11 SIM session,
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134 but sysmoUSIM-SJS1 does not allow the same. sysmoUSIM-SJS1 accepts its ADM1 key
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135 only via UICC-style (CLA=00) VERIFY PIN APDUs, thus at first it appears that
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136 these cards cannot be admin-programmed via the classic GSM 11.11 SIM protocol.
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137 They do have one open loophole, however: if the UICC-style VERIFY PIN command
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138 for ADM1 is sent as the very first command in a card session, it can be followed
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139 by other UICC protocol commands (making a regular UICC session), or it can be
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140 followed by GSM 11.11 SIM protocol commands with CLA=A0, thus allowing one
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141 special exception to the general rule which prohibits mixing these two protocols
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142 in the same card session.
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143
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144 Our fc-simtool command for sending SJS1 ADM1 keys in the manner this card model
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145 requires is as follows:
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146
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147 verify-sjs1-adm1 xxxxxxxx
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148
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149 The really big restriction is that this command must be issued at the very
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150 beginning of your fc-simtool session, before any other commands. If you issue
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151 this command later, after some GSM 11.11 SIM APDUs have already been exchanged,
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152 it won't work. For this reason, our sws-auth-adm1 "macro" command cannot be
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153 used in fc-simtool with SJS1 cards: in order to use sws-card-db, one has to read
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diff changeset
154 the ICCID record to identify the specific card out of the pool, and once some
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diff changeset
155 APDUs have been exchanged to make that ICCID read, the special exception to the
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diff changeset
156 protocol mixing prohibition is no longer available. One could develop a more
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parents: 18
diff changeset
157 complicated system where you read the ICCID, then reset the card and have a new
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
diff changeset
158 card session beginning with ADM1 authentication - but because this
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159 sysmoUSIM-SJS1 card model is no longer sold by Sysmocom, there is no
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
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parents: 18
diff changeset
160 justification for expending the effort.
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161
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diff changeset
162 Using fc-uicc-tool with Sysmocom webshop cards
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163 ==============================================
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164
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diff changeset
165 The UICC protocol is native to both sysmoUSIM-SJS1 and sysmoISIM-SJA2, thus
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diff changeset
166 fc-uicc-tool works like a charm with both card models. The problem, however,
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167 is that fc-uicc-tool is only a low-level debug and manual tinkering tool: it
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
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168 can do "everything", but only 100% manually in raw hex. Most of the high-level
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169 functions of fc-simtool are not replicated in fc-uicc-tool, and furthermore, an
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
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diff changeset
170 approach of mindlessly translating fc-simtool high-level functions to use the
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
diff changeset
171 UICC protocol for card file access won't work either: the USIM spec definition
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Mychaela Falconia <falcon@freecalypso.org>
parents: 18
diff changeset
172 of many important files is quite different from the original DF_GSM and
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
Mychaela Falconia <falcon@freecalypso.org>
parents: 18
diff changeset
173 DF_TELECOM definitions for classic SIM.
18
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174
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diff changeset
175 The issue is ultimately one of project purpose and direction: FreeCalypso
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diff changeset
176 focuses on GSM/2G to the exclusion of later G's, our preferred SIM cards are
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177 our own FCSIM1, our primary SIM card manipulation tool is fc-simtool, and
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178 fc-uicc-tool exists only as a bounded-effort side utility. For people who
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179 prefer to work with USIM/ISIM cards natively, programming all of their new
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180 files for later-G functionality, other software tool projects like pysim-shell
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parents: 18
diff changeset
181 would be more appropriate.
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diff changeset
182
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diff changeset
183 ADM1 and other PIN authentication in fc-uicc-tool
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184 =================================================
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185
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186 If you are in an fc-uicc-tool session with either sysmoUSIM-SJS1 or
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diff changeset
187 sysmoISIM-SJA2, the command to authenticate with ADM1 is as follows:
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188
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189 verify-pin 10 xxxxxxxx
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190
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diff changeset
191 where xxxxxxxx are the 8 digits of the ADM1 secret code. There are no
b9fc7022f9ac doc/Sysmocom-SIM-notes: update for current situation
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192 restrictions as to when this command may be given in an fc-uicc-tool session.
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diff changeset
193
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194 sws-auth-* and sws-lookup commands work in fc-uicc-tool exactly the same way as
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195 in fc-simtool.
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196
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197 Changing the ADM1 PIN
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198 =====================
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199
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200 Experiments show that when speaking the UICC protocol to the card, the standard
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201 CHANGE PIN command does work on ADM1 on both sysmoUSIM-SJS1 and sysmoISIM-SJA2,
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202 thus you can do the following in fc-uicc-tool:
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203
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204 change-pin 10 old-ADM1 new-ADM1
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205
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206 However, given that Sysmocom already assigns individual per-card random ADM1 and
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207 communicates these secret codes securely to webshop customers, there does not
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208 seem to be any practical need for changing ADM1 further downstream. Thus our
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209 recommendation is that if you are going to change your ADM1 PIN just to prove
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210 that you can do it, you should then change it back to the original.
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211
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212 We can only surmise that there probably exist some secret commands that can
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213 reset PUK1 and PUK2 after you've authenticated with ADM1, but they will probably
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214 remain forever proprietary to Sysmocom, especially given the lack of any
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215 practical need for such downstream changing of PUK1/PUK2.
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216
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217 MSISDN misprogramming on early sysmoUSIM-SJS1 cards
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218 ===================================================
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219
56
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220 Sysmocom webshop cards (both sysmoUSIM-SJS1 and sysmoISIM-SJA2) have their
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221 EF_MSISDN file allocated as 6 records of 34 bytes each. Record length of 34
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222 bytes translates into 20 bytes of alpha tag plus the required 14-byte structure
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diff changeset
223 at the end of each record.
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224
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225 When Sysmocom made their early sysmoUSIM-SJS1 cards, they intended to program
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226 the first record of EF_MSISDN as +882110xxxxx, where xxxxx are equal to the last
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227 5 digits of their 901-70 IMSI and also to the last 5 content digits (before the
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228 Luhn check digit) of their 8988211 ICCID. A correctly structured EF_MSISDN
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229 phonebook record with a +882110xxxxx phone number would look like this, for the
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230 record size of 34 bytes:
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231
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232 00: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
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233 10: FF FF FF FF 07 91 88 12 01 xx xx Fx FF FF FF FF
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234 20: FF FF
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235
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236 The first 20 bytes are all FF because that is the space reserved for the alpha
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237 tag, then the phone number is encoded in 8 bytes as 07 91 88 12 01 xx xx Fx,
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238 and the rest of the required 14-byte structure is filled with FF bytes.
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239 However, the actual programming of this MSISDN record on early sysmoUSIM-SJS1
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240 cards (at least on the 10-pack I bought in 2017) looks like this:
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241
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242 00: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
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243 10: FF FF 07 91 88 12 01 xx xx Fx FF FF FF FF FF FF
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244 20: FF FF
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245
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246 The not-all-FF field of 8 bytes is written into the wrong location, two bytes
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247 earlier than where it should be. When I saw this misprogramming early in the
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248 course of developing fc-simtool, I finally understood why the AT+CNUM command
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249 on a FreeCalypso modem with this SIM inserted reported a 10xxxxx number instead
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250 of the +882110xxxxx listed in the sysmoUSIM manual. :-)
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251
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252 When I saw this misprogramming, I also added a fix-sysmo-msisdn command to
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253 fc-simtool: this command checks for this particular misprogramming, and if it
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254 finds such, it rewrites the MSISDN record with the 8-byte phone number field
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255 moved to its correct place. However, this fix-sysmo-msisdn command probably
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256 won't get much use: the factory-programmed EF_MSISDN is now completely blank on
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257 Sysmocom's current sysmoISIM-SJA2 cards, and also on the late sysmoUSIM-SJS1
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258 cards - or at least it is blank on the last-stock cards I bought in 2020-11.
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259 EF_MSISDN is writable without needing ADM1 - it only needs CHV1.