AT COMMAND command set: 1. AT+CGMI gives the module manufacturer\'s identification. 2. AT+CGMM gets the module identification. This command is used to get the supported frequency bands (GSM 900, DCS 1800 or PCS 1900). When the module has multiple frequency bands, the response may be a combination of different frequency bands. 3. AT+CGMR gets the modified software version. 4. AT+CGSN gets the IMEI (International Mobile Equipment Identity) serial number of the GSM module. 5. AT+CSCS selects the TE feature setting. This command reports the ME on which state setting the TE uses. The ME can then convert each input or displayed letter. This is used to send, read or write SMS messages. 6. AT+WPCS sets the phonebook state. This special command reports the ME on the state used by the TE phonebook. The ME can then convert each input or displayed string letter. This is used to read or write phonebook entries. 7. AT+CIMI gets the IMSI. This command is used to read or identify the IMSI (International Mobile Subscriber Identity) of the SIM card. The PIN should be entered before reading the IMSI (if a PIN is required). 8. AT+CCID Get the identification of the SIM card. This command enables the module to read the EF-CCID file on the SIM card. 9. AT+GCAP Get the capability table. (Supported function) 10. A/ Repeat the last command. Only the A/ command cannot be repeated. This command repeats the previously executed command. 11. AT+CPOF Power off. This special command stops the GSM software stack and hardware layer. The function of the command AT+CFUN=0 is the same as +CPOF. 12. AT+CFUN Set phone capabilities. This command selects the capability level of the mobile station. 13. AT+CPAS Returns the activity status of the mobile device. 14. AT+CMEE Report errors of the mobile device. This command determines whether to allow or not to use the result code \"+CME ERROR:
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