Any phone with a sim and gps can be hacked by state sponsored hackers even when off.

Even when the phone is off it can be hacked via backdoors I bet. This is why faraday bags are so popular on Amazon. Just put your phone in, have your friend call it, and if it doesn't ring then you are safe. That is common sense and if you are a dumb ass immoral criminal you don't deserve to know this and go fuck off loser!