Siemens M20 Terminal Technical Description page 167

Siemens Information and Communication Products
The entries are in hexadecimal format. The record has a length of OxOD = 13 Bytes and the file has a length of 0x82 =
130 bytes. Therefore the file has 130/13 = 10 entries.
EF
EXT2
at+crsm=0xc0,0x6f4b
+CRSM: 144,0,000000416F4B040012F4440102010D
Therefore there are 65/13 = 5 entries.
Individual entries can be read with the AT+CRSM command.
Entry 1 and 5 of EF
EXT1
at+crsm=0xb2,0x6f4a,1,4
+CRSM: 144,0,0206099078563412FFFFFFFFFF
at+crsm=0xb2,0x6f4a,5,4
+CRSM: 144,0,FFFFFFFFFFFFFFFFFFFFFFFFFF
In this case there is no entry in index 5.
Note: If there are entries in EF
EF and EF can manually be deleted with the AT+CRSM command.
EXT1 EXT2
Behaviour with full EF
EXT1
The command AT+CPBW writes numbers with less than 20 digits normally to the SIM card. If the number is longer than
20 digits, there will be an error result code "AT+CME ERROR: SIM failure" and the entry is not written to the phone-
book. When calling a 40 digits number with ATD, there will no number be written to the "LD" phonebook. No error mes-
sage is reported.
Version 8 dated 15.03.00
and EF without corresponding entries in the SIM phonebooks, the entries in
EXT1 EXT2
Application notes
A
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