One. General commands 1.AT+CGMI gives the logo of the module manufacturer. 2.AT+CGMM gets module identifier. This command is used to get the supported frequency bands (GSM 900, DCS 1800 or PCS 1900). When When the module has multi band, the response may be the combination of different frequency bands. 3.AT+CGMR gets the software version of the module. 4.AT+CGSN obtains GSM module IMEI (international mobile device identification) serial number. 5.AT+CSCS selects TE feature settings. This command reports which state set ME is used in TE. ME can then convert each input or display letter. This is for sending. Reading or writing short messages. 6.AT+WPCS sets phonebook status. This special command reports the status of the ME used by the TE phone book. ME can then convert each input or displayed string letter. This is the entrance to read or write phonebook.

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