Only power off when unlocked iphone

Sorry for spelling errors , I am using google translator .

The idea is if you can or not and how to turn an iPhone only when unlocked.

The point is that if someone steals it we can turn it off with the phone locked and therefore we could not trace him .

The only alternative would have the thief is expected to run out of battery .

Well, that's my question , I would like to know your opinion , greetings .

😉