Siemens M1 - Manual (Page 16)

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GSM M1 Module, English: A24859-N4000-A100-1-7677 gsm-m1-e.fm
Overview of AT commands
6.3.96
AT&Zn=x Store telephone number "x" in memory "n"
AT%Dn Automatic dialing with DTR
AT+ Fax commands
AT+CGMI Display manufacturer ID
AT+CGMM Display model ID
AT+CGMR Display version of GSM module
AT+CGSN Display serial number (IMEI)
AT+CHUP Terminate all calls
AT+CEER Display reason last call was disconnected
AT+CMEE Extended error messages to GSM 07.07
AT+CREG Display registration status
AT+COPS Commands relating to network operator selection
AT+CPIN Enter PIN and query blocks
AT+CPIN2 Enter PIN2 and query PIN2 blocks
AT+CPWD Change PIN
AT+CSQ Display signal quality information
AT+CKPD Key simulation
AT+CXXSN Single-numbering parameterization
AT+CXXMOC Parameterize for outgoing calls
AT+CPBS Select phonebook
AT+CPBR Read phonebook entry
AT+CPBW Write phonebook entry
AT+CBST Select bearer service type
AT+CRC Cellular result code
AT+CLIP Calling line identification presentation
AT+CPAS Phone activity status
AT+FCLASS Select mode
AT+CXXCID Card identification
AT+CSMS Select message service
AT+CPMS Preferred message storage
AT+CMGF Message format
AT+CSCA Service center address
AT+CMGR Read message
AT+CMGS Send message
AT+CMGW Write message to memory
AT+CMGD Delete message
AT+CNMI New message indications
AT+CMGL List messages
Please note: The GSM module also recognizes some AT-standard commands that it
does not execute, but it ignores these commands and returns either OK or ERROR.
GSM AT commands (GSM 07.07)
SMS AT commands (GSM 07.05)