The proprietary %CSUS command is used to select the Universal Integrated Circuit Card (UICC) slot to be used by the modem.v1.3.x≥4
All Universal Subscriber Identity Module (USIM) and UICC activity is directed to the selected slot the next time the modem or UICC is activated. The slot covers also Soft SIM solutions, such as virtual iUICC, in addition to physical UICC slot.
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.v1.3.x≥2
The stored configuration is reset to 0 with the %XFACTORYRESET command's <reset_type>s 0 and 1.
If the UICC slot has been set to 2 and modem firmware is updated to a version that does not support slot 2, the modem uses the default slot 0.
+CFUN=0 command or deactivated with the
+CFUN=4 command.