Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 133 12/24/2010
When enabled, an unsolicited result code is returned after the connection
has been terminated
+CDRIND: <type>
Parameter
<type> connection type
0 CSV connection
1 CSD connection
2 PPP connection
Reference Note
6.2.18 AT+CSPN Get Service Provider Name from SIM
AT+CSPN Get Service Provider Name from SIM
Response:
+CSPN: <spn>,<display mode>
OK
If error is related to ME functionality:
+CME ERROR: <err>
Read Command
AT+CSPN?
Parameters
<spn> string type(string should be included in quotation
marks); service provider name on SIM
<display mode> 0 not display PLMN. Already registered on PLMN
1 display PLMN
Reference Note
CME errors occur if SIM is not inserted.
6.2.19 AT+CCVM Get and Set the Voice Mail Number on the SIM
AT+CCVM Get and Set the Voice Mail Number on the SIM
Response
+CCVM: maximum length of field <vm number>[, maximum length of
field <alpha string>]
OK
Test Command
AT+CCVM=?
Parameters
See Write Command
Read Command
AT+CCVM?
Response
If voice mail number is not set:
OK
If voice mail number is set:
+CCVM: <vm number>[,<alpha string>]