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annotate doc/PLMN-list-commands @ 50:d73fddc64485

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doc/Simtool-command-shell: update for new target selection
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 Mar 2021 06:42:29 +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.
da6e9d0b2ee6 data, doc, scripts: import from previous fc-pcsc-tools repo
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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
da6e9d0b2ee6 data, doc, scripts: import from previous fc-pcsc-tools repo
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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
da6e9d0b2ee6 data, doc, scripts: import from previous fc-pcsc-tools repo
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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
da6e9d0b2ee6 data, doc, scripts: import from previous fc-pcsc-tools repo
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50 plmnsel-* with fplmn-*; all arguments are the same.