I had a idea few days ago while doing something with my sim card. For example you do sensitive texting via WhatsApp or signal etc. So if someone claims your phone he can just take the sim card and make a new WhatsApp if you don't have pin enabled. And continue where you left off.
The idea is if it is possible to make. The sim card slot is locked or it can't be taken out without allowing it via the phone setting. So some kind of a lock.
Just thinking out loud. Hope it makes sense