The proprietary %FEACONF command is used to set support for the configurable features of the modem.
The command configuration is
stored to Non-volatile Memory (NVM) approximately every 48 hours and when the modem is
set to minimum functionality mode with the +CFUN=0
command.
Active %XPOFWARN warning blocks the storing to NVM.
All configurable features are disabled by default.
Note: Operator configurations can override values set by the
user.