Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 135 23.06.2010
Parameters
<spn> string type(string should be included in quotation
marks); service provider name on SIM
<display mode> 0 – don’t display PLMN. Already registered on
PLMN
1 – display PLMN
Reference Note
CME errors if SIM not inserted.
6.2.18 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
If voice mail number is not set:
OK
If voice mail number is set:
+CCVM: <vm number>[,<alpha string>]
OK
Read Command
AT+CCVM?
Parameters
See Write Command
Response
+CCVM: maximum length of field <vm number>[, maximum length of
field <alpha string>]
OK
Test Command
AT+CCVM=?
Parameters
See Write Command
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CCVM=<vm
number>[,<alpha
string>]
Parameters
<vm number> String type(string should be included in quotation marks)
-The voice mail number to write to the SIM
<alpha string> String type(string should be included in quotation marks)
-The alpha-string to write to the SIM
Reference Note