SimCom SIM7000 Series At Command Manual page 118

Parameters
See Write Command
Read Command Response
AT+CGSMS? +CGSMS: <service>
OK
Parameters
See Write Command
Write Command Response
AT+CGSMS=<se OK
rvice> If error is related to ME functionality:
+CME ERROR: <err>
Parameters
<service>
preference to be used
switched not available)
Parameter Saving AUTO_SAVE
Mode
Max Response -
Time
Reference Note
SIM7000 Series_AT Command Manual_V1.03
A numeric parameter which indicates the service or service
0 Packet Domain(value is not really supported and is
internally mapped to 2)
1 Circuit switched(value is not really supported and is
internally mapped to 3)
2 Packet Domain preferred (use circuit switched if
GPRS not available)
3 Circuit switched preferred (use Packet Domain if circuit
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Smart Machine Smart Decision
2018-05-08