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annotate doc/PLMN-list-commands @ 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 da6e9d0b2ee6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 GSM SIM specs define EF_PLMNsel and EF_FPLMN as containing lists of preferred
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2 and forbidden PLMNs, respectively. Both files are defined as writable by
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3 ordinary users, requiring only CHV1 access for both reading and writing - and
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4 both files are indeed user-writable on Grcard and Sysmocom SIMs. However, some
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5 operator-issued SIMs (specifically T-Mobile USA) implement an underhanded trick:
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6 whenever we try to write anything to either of these two files, the write
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7 operation appears to succeed (SW 0x9000), but the byte content of the SIM file
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8 remains unchanged. Therefore, writability of these files by ordinary end users
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9 on regular operator-issued SIMs should be regarded as questionable.
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11 fc-simtool provides high-level commands for both dumping (reading) and writing
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12 both EF_PLMNsel and EF_FPLMN. Here are the commands for EF_PLMNsel:
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14 plmnsel-dump
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16 This command dumps the full content of EF_PLMNsel.
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18 plmnsel-write index mcc-mnc
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20 This command writes a single entry into EF_PLMNsel. The first argument is the
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21 0-based index of the entry position to write into, and the second argument is
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22 the PLMN code as in MCC-MNC.
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24 plmnsel-write-list plmn-list-file
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26 This command overwrites the entire EF_PLMNsel SIM file with a user-specified
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27 PLMN list given in an ASCII data file. The file must contain PLMN codes
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28 (MCC-MNC) separated by white space; any lines or line tails beginning with '#'
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29 are treated as comments. Output from a previous plmnsel-dump is acceptable
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30 input to plmnsel-write-list. PLMN codes are written into EF_PLMNsel from index
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31 0 onward; any unused space at the end is filled with FF bytes.
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33 plmnsel-erase start-index [end-index]
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35 This command erases a single entry position or a range of entry positions in
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36 EF_PLMNsel. Because EF_PLMNsel is a transparent EF (not record-based) at the
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37 SIM protocol level, our numbering of entry positions in this file is 0-based,
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38 rather than the 1-based convention used for record-based SIM files. Keyword
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39 "end" may be specified instead of the final index, meaning erase to the end of
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40 the file.
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42 plmnsel-erase-all
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44 This command overwrites the entire EF_PLMNsel SIM file with FF bytes,
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45 corresponding to fully erased state. This command is more efficient than
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46 'plmnsel-erase 0 end', as the operation is performed with a single UPDATE BINARY
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47 SIM protocol command.
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48
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49 The commands for EF_FPLMN parallel those for EF_PLMNsel: simply replace
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50 plmnsel-* with fplmn-*; all arguments are the same.