Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 6 12/24/2010
3.2.23 AT+CPAS Phone Activity Status...............................................................................67
3.2.24 AT+CPBF Find Phonebook Entries...........................................................................67
3.2.25 AT+CPBR Read Current Phonebook Entries ............................................................69
3.2.26 AT+CPBS Select Phonebook Memory Storage.........................................................69
3.2.27 AT+CPBW Write Phonebook Entry..........................................................................71
3.2.28 AT+CPIN Enter PIN..................................................................................................72
3.2.29 AT+CPWD Change Password...................................................................................73
3.2.30 AT+CR Service Reporting Control ...........................................................................74
3.2.31 AT+CRC Set Cellular Result Codes for Incoming Call Indication ...........................74
3.2.32 AT+CREG Network Registration..............................................................................75
3.2.33 AT+CRLP Select Radio Link Protocol Parameters ...................................................77
3.2.34 AT+CRSM Restricted SIM Access ...........................................................................77
3.2.35 AT+CSQ Signal Quality Report ................................................................................78
3.2.36 AT+FCLASS FAX: Select, Read or Test Service Class ............................................79
3.2.37 AT+FMI FAX: Report Manufactured ID...................................................................80
3.2.38 AT+FMM FAX: Report Model ID ............................................................................80
3.2.39 AT+FMR FAX: Report Revision ID .........................................................................80
3.2.40 AT+VTD Tone Duration............................................................................................81
3.2.41 AT+VTS DTMF and Tone Generation ......................................................................81
3.2.42 AT+CMUX Multiplexer Control...............................................................................82
3.2.43 AT+CNUM Subscriber Number................................................................................84
3.2.44 AT+CPOL Preferred Operator List............................................................................85
3.2.45 AT+COPN Read Operator Names.............................................................................85
3.2.46 AT+CFUN Set Phone Functionality ..........................................................................86
3.2.47 AT+CCLK Clock.......................................................................................................87
3.2.48 AT+CSIM Generic SIM Access ................................................................................87
3.2.49 AT+CALM Alert Sound Mode..................................................................................88
3.2.50 AT+CALS Alert Sound Select...................................................................................89
3.2.51 AT+CRSL Ringer Sound Level.................................................................................89
3.2.52 AT+CLVL Loud Speaker Volume Level ...................................................................90
3.2.53 AT+CMUT Mute Control..........................................................................................91
3.2.54 AT+CPUC Price Per Unit and Currency Table..........................................................92
3.2.55 AT+CCWE Call Meter Maximum Event ..................................................................92
3.2.56 AT+CBC Battery Charge...........................................................................................93
3.2.57 AT+CUSD Unstructured Supplementary Service Data.............................................94
3.2.58 AT+CSSN Supplementary Services Notification ......................................................95
4 AT Commands According to GSM07.05.....................................................................................97
4.1 Overview of AT Commands According to GSM07.05..........................................................97
4.2 Detailed Descriptions of AT Commands According to GSM07.05.......................................97
4.2.1 AT+CMGD Delete SMS Message...............................................................................97
4.2.2 AT+CMGF Select SMS Message Format ...................................................................98
4.2.3 AT+CMGL List SMS Messages from Preferred Store................................................99
4.2.4 AT+CMGR Read SMS Message ...............................................................................102
4.2.5 AT+CMGS Send SMS Message................................................................................105