Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 6 23.06.2010
3.2.22 AT+COPS Operator Selection...................................................................................68
3.2.23 AT+CPAS Phone Activity Status...............................................................................69
3.2.24 AT+CPBF Find Phonebook Entries...........................................................................69
3.2.25 AT+CPBR Read Current Phonebook Entries............................................................70
3.2.26 AT+CPBS Select Phonebook Memory Storage.........................................................71
3.2.27 AT+CPBW Write Phonebook Entry..........................................................................72
3.2.28 AT+CPIN Enter PIN..................................................................................................74
3.2.29 AT+CPWD Change Password...................................................................................74
3.2.30 AT+CR Service Reporting Control ...........................................................................75
3.2.31 AT+CRC Set Cellular Result Codes for Incoming Call Indication ...........................76
3.2.32 AT+CREG Network Registration..............................................................................77
3.2.33 AT+CRLP Select Radio Link Protocol Parameters ...................................................79
3.2.34 AT+CRSM Restricted SIM Access ...........................................................................79
3.2.35 AT+CSQ Signal Quality Report ................................................................................80
3.2.36 AT+FCLASS FAX: Select, Read or Test Service Class ............................................81
3.2.37 AT+FMI FAX: Report Manufactured ID...................................................................82
3.2.38 AT+FMM FAX: Rreport Model ID...........................................................................82
3.2.39 AT+FMR FAX: Report Revision ID .........................................................................82
3.2.40AT+VTD Tone Duration ............................................................................................83
3.2.41 AT+VTS DTMF and Tone Generation ......................................................................83
3.2.42 AT+CMUX Multiplexer Control...............................................................................84
3.2.43 AT+CNUM Subscriber Number................................................................................86
3.2.44 AT+CPOL Preferred Operator List............................................................................86
3.2.45 AT+COPN Read Operator Names.............................................................................87
3.2.46 AT+CFUN Set Phone Functionality. .........................................................................88
3.2.47 AT+CCLK Clock.......................................................................................................89
3.2.48 AT+CSIM Generic SIM Access ................................................................................89
3.2.49 AT+CALM Alert Sound Mode..................................................................................90
3.2.50 AT+CALS Alert Sound Select...................................................................................91
3.2.51 AT+CRSL Ringer Sound Level.................................................................................91
3.2.52 AT+CLVL Loud Speaker Volume Level ...................................................................92
3.2.53 AT+CMUT Mute Control..........................................................................................93
3.2.54 AT+CPUC Price Per Unit and Currency Table..........................................................93
3.2.55 AT+CCWE Call Meter Maximum Event ..................................................................94
3.2.56 AT+CBC Battery Charge...........................................................................................95
3.2.57 AT+CUSD Unstructured Supplementary Service Data.............................................95
3.2.58 AT+CSSN Supplementary Services Notification......................................................96
4 AT Commands According to GSM07.05.....................................................................................98
4.1 Overview of AT Commands According to GSM07.05..........................................................98
4.2 Detailed Descriptions of AT Commands According to GSM07.05.......................................98
4.2.1 AT+CMGD Delete SMS Message...............................................................................98
4.2.2 AT+CMGF Select SMS Message Format ...................................................................99
4.2.3 AT+CMGL List SMS Messages from Preferred Store..............................................100
4.2.4 AT+CMGR Read SMS Message...............................................................................103