AT Commands for WR21, EX15 and EX50

Hi :=)

I have started using the commands on the WR21 and i have found : that showcases 2 commands for the WR21

Is it also possible to disable the connection of interface, so that no communication between the ISP and the SIM card is being made? ofc. i would like to enable that same interface when i need it over an ssh connection again. Is this possible? If so, can i do the same on the EX15 and EX50 routers as well?