Specifications

SIM900 AT Command Manual
searching an operator to register to
The GPRS service is enabled, but an allowable PLMN is
currently not available. The UE will start a GPRS
attach as soon as an allowable PLMN is available.
3 Registration denied
The GPRS service is disabled, the UE is not allowed to
attach for GPRS if it is requested by the user.
4 Unknown
5 Registered, roaming
<lac> string type (string should be included in quotation marks); two
byte location area code in hexadecimal format (e.g. "00C3"
equals 195 in decimal)
<ci> string type (string should be included in quotation marks); two
bytes cell ID in hexadecimal format
Reference Note
7.2.11 AT+CGSMS Select Service for MO SMS Messages
AT+CGSMS Select Service for MO SMS Messages
Response
+CGSMS: (list of currently available <service>s)
OK
Test Command
AT+CGSMS=?
Parameter
See Write Command
Response
+CGSMS: <service>
OK
Read Command
AT+CGSMS?
Parameter
See Write Command
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CGSMS=<se
rvice>
Parameter
<service> a numeric parameter which indicates the service or service
preference to be used
0 Packet Domain
SIM900_AT Command Manual_V1.03 167 12/24/2010