The +CEMODE command sets the device mode of operation.v2.0.x
For reference, see 3GPP 27.007 Ch. 10.1.28.
Set command
The set command sets the CS/PS Mode of Operation. The +CEMODE command should be used only when the modem is not activated. The command configuration is stored to NVM approximately every 48 hours and when the modem is set to minimum functionality mode with the +CFUN=0 command.
Read command
The read command reads the current mode of operation.
Test command
The test command lists the supported modes of operation.