how do you call a phone that has no sim card but is in airplane mode? ok put it in a faraday bag but im asking if anyone has tested whether just plain airplane mode is leaking any signal to the outside world we know faraday bags do work but how well do airplanes mode work on their own, is the question, and maybe this will also vary depending on the software (stock, android, ios, whatever)

yes, you can have airplane mode on and you can switch on wifi and wifi works, but is your device leaking data to towers when in airplane mode with no sim card, is the question