What if I simply reset my Android phone to factory settings just before exiting the plane? Can they force me to log in to my Android account in order to get to my FB?

And what if my battery is dead or my phone stops working? Can they force me to log in to their own Android phone?

What if I don't carry any phone at all, can they simply force me to log in to an empty phone? (Assuming everyone has an Android or Apple phone or is going to spend couple days in detention.)