Even with the phone "powered off" or in airplane mode, compromised baseband firmware can keep certain radio components alive. Attackers can send a silent SMS (a Class 0 flash SMS or a binary SMS) that the baseband processes without the OS ever registering it. The baseband then turns on the microphone and streams audio over a hidden data channel.
Most codes are entered directly into your phone’s dialer. Note that many of these are manufacturer or carrier-dependent. gsm+secret+firmware
: Often displays the FTA Software Version , which is a specific identifier for the firmware's functional test alignment. Security & Privacy Implications Even with the phone "powered off" or in