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That's good to know that Mafia will kill me after unlocking my phone not before :)

They just need your thumb...

Incorrect. Read my grandparent comment.

(Though it may work for a very short period of time if you were alive when they cut it off, but not for long)

OK, thanks, I understand. (I hope we'll never read it in the news "thief cuts off finger".)

If we do, it'll be 'uninformed thief cuts off finger but still fails to hack into phone'.