How about just remembering those 4 digits to get access to all those so so very, very important photos and top important work data that you only keep in your phone!? Wtf?! Return the phone to its owner, maybe that person remembers those 4 digits. If you are the owner, next time, keep those so important and only photos/data somewhere else thna in your phone and try to remember just four digits. Lesson learnt.
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