Re:What is AT&T doing at 1111340002?
by lxgr on Sunday November 07, 2021 @04:54AM
(#29137931)
Depends a lot on how airplane mode is implemented on a given device, I'd say. To my knowledge, this is not specified by the relevant standards.
One way would be to shut down the SIM as soon as it's activated, which would include proactive commands of any kind (like those the SIM uses to request sending an SMS from the phone/baseband).
Another would be to keep the baseband and SIM active, but to still deactivate the radio – in this the SIM might still be able to issue proactive commands, but without any network attachment, they would just fail.
Of course an implementation could also choose to briefly reattach to the network whenever it receives such a proactive command.
One way would be to shut down the SIM as soon as it's activated, which would include proactive commands of any kind (like those the SIM uses to request sending an SMS from the phone/baseband).
Another would be to keep the baseband and SIM active, but to still deactivate the radio – in this the SIM might still be able to issue proactive commands, but without any network attachment, they would just fail.
Of course an implementation could also choose to briefly reattach to the network whenever it receives such a proactive command.