Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 155 23.06.2010
7 AT Commands for GPRS Support
7.1 Overview of AT Commands for GPRS Support
Command Description
AT+ CG ATT ATTACH/DETACH FROM GPRS SERVICE
AT+CGDCONT DEFINE PDP CONTEXT
AT+CGQMIN QUALITY OF SERVICE PROFILE (MINIMUM ACCEPTABLE)
AT+CGQREQ QUALITY OF SERVICE PROFILE (REQUESTED)
AT+CGACT PDP CONTEXT ACTIVATE OR DEACTIVATE
AT+CGDATA ENTER DATA STATE
AT+CGPADDR SHOW PDP ADDRESS
AT+CGCLASS GPRS MOBILE STATION CLASS
AT+ CG ERE P CONTROL UNSOLICITED GPRS EVENT REPORTING
AT+ CG REG NETWORK REGISTRATION STATUS
AT+ CG SM S SELECT SERVICE FOR MO SMS MESSAGES
7.2 Detailed Descriptions of AT Commands for GPRS Support
7.2.1 AT+CGATT Attach /Detach from GPRS Service
AT+CGATT Attach /Detach from GPRS Service
Test Command
AT+CGATT=?
Response
+CGATT: (list of supported <state>s)
OK
Parameter
See Write Command
Read Command
AT+CGATT?
Response
+CGATT: <state>
OK
Parameter
See Write Command
Write Command
AT+CGATT=<st
ate>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Parameter
<state> indicates the state of GPRS attachment
0 – detached
1 – attached
Other values are reserved and will result in an ERROR
response to the Write Command.