6.1.5 +CPBW, Write Phone Book Entry.................................................................................................79
6.2 System Date and Time Access Commands........................................................................................... 81
6.2.1 +CCLK, Read/Set System Date and Time.................................................................................. 81
7 SMS.......................................................................................................................................................................... 83
7.1 SMS Commands......................................................................................................................................... 83
7.1.1 +CPMS, Preferred Message Storage.......................................................................................... 83
7.1.2 +CMGF, Message Format.............................................................................................................. 84
7.1.3 +CSCA, Service Center Address.................................................................................................. 85
7.1.4 In SMS text mode, SCA stored in SIM is added to any stored and sent SMS......................85
7.1.5 +CSMP, Set Text Mode Parameters.............................................................................................89
7.1.6 +CSDH, Show Text Mode Parameters.........................................................................................91
7.1.7 +CNMI, New Message Indications to Terminal...........................................................................92
7.1.8 +CMTI, Unsolicited Response (New SMS-DELIVER Receipt Indication)............................. 95
7.1.9 +CMT, Unsolicited Response (New SMS-DELIVER Receipt)................................................. 95
7.1.10 +CDS, Unsolicited Response (New SMS-STATUS-REPORT Receipt)...............................97
7.1.11 +CMGL, +MMGL,List Messages.................................................................................................98
7.1.12 +CMGR, +MMGR, Read Message.......................................................................................... 102
7.1.13 +CMSS, Send Message from Storage.................................................................................... 109
7.1.14 +CMGW, Write Message to Memory....................................................................................... 110
7.1.15 +CMGD, Delete Message.......................................................................................................... 116
7.1.16 +CMGS, Send SM to Network.................................................................................................. 117
8 Access and Security............................................................................................................................................. 119
8.1 Access Control Commands..................................................................................................................... 119
8.1.1 A/, Repeat Last Command........................................................................................................... 119
8.1.2 AT, Check AT Communication......................................................................................................119
8.1.3 +CPIN, Enter PIN for Unlocking SIM Card or Enter PUK for Unblocking SIM Card......... 120
8.1.4 +TPIN, Query Number of Remaining SIM PIN/PUK Entering Attempts.............................. 123
8.1.5 +CPWD, Change Password........................................................................................................ 124
8.1.6 +CLCK, Facility Lock.................................................................................................................... 126
9 Network.................................................................................................................................................................. 129
9.1 Network Commands................................................................................................................................. 129
9.1.1 +CSQ, Signal Strength................................................................................................................. 129
9.1.2 +CREG, Network Registration Status........................................................................................130
9.1.3 +CGREG, GPRS Network Registration.....................................................................................131
9.1.4 +COPS, Operator Selection........................................................................................................ 133
9.1.5 +CPOL, Preferred Operators.......................................................................................................136
9.1.6 +MCELL, Module Cell Description............................................................................................. 139
9.1.7 +MCELL Indication........................................................................................................................ 140
9.1.8 +MCI, Module Cell Information................................................................................................... 143