Specifications
3 AT Commands According to GSM07.07 
3.1 Overview of AT Command According to GSM07.07 
Command  Description 
AT+ CA CM   ACCUMULATED CALL METER(ACM) RESET OR QUERY 
AT+CAMM  ACCUMULATED CALL METER MAXIMUM(ACM MAX) SET OR 
QUERY 
AT+CAOC  ADVICE OF CHARGE 
AT+CBST  SELECT BEARER SERVICE TYPE 
AT+CCFC  CALL FORWARDING NUMBER AND CONDITIONS CONTROL 
AT+CCWA  CALL WAITING CONTROL 
AT+CEER  EXTENDED ERROR REPORT 
AT+ CG MI  REQUEST MANUFACTURER IDENTIFICATION 
AT+CGMM  REQUEST MODEL IDENTIFICATION 
AT+ CG MR   REQUEST TA REVISION IDENTIFICATION OF SOFTWARE 
RELEASE 
AT+CGSN  REQUEST PRODUCT SERIAL NUMBER IDENTIFICATION 
(IDENTICAL WITH +GSN) 
AT+CSCS  SELECT TE CHARACTER SET 
AT+ CS TA  SELECT TYPE OF ADDRESS 
AT+CHLD  CALL HOLD AND MULTIPARTY 
AT+CIMI  REQUEST INTERNATIONAL MOBILE SUBSCRIBER IDENTITY 
AT+CLCC  LIST CURRENT CALLS OF ME 
AT+ CL CK  FACILITY LOCK 
AT+ CL IP  CALLING LINE IDENTIFICATION PRESENTATION 
AT+ CL IR  CALLING LINE IDENTIFICATION RESTRICTION 
AT+CMEE  REPORT MOBILE EQUIPMENT ERROR 
AT+ CO LP  CONNECTED LINE IDENTIFICATION PRESENTATION 
AT+COPS  OPERATOR SELECTION 
AT+ CPA S  PHONE ACTIVITY STATUS 
AT+CPBF  FIND PHONEBOOK ENTRIES 
AT+CPBR  READ CURRENT PHONEBOOK ENTRIES 
AT+CPBS  SELECT PHONEBOOK MEMORY STORAGE 
AT+ CP BW  WRITE PHONEBOOK ENTRY 
AT+ CP IN  ENTER PIN 
AT+ CP WD  CHANGE PASSWORD 
AT+CR  SERVICE REPORTING CONTROL 
AT+CRC  SET CELLULAR RESULT CODES FOR INCOMING CALL 
SIM300_ATC_V1.03  1  08.29.2008 










