I apologise in advance for this morbid thought. Imagine you get in an accident. It could be anything. A hit and run, a mugging gone wrong or just plain bad luck. There you are lying on the road, covered in your own blood, unconscious, helpless. Maybe your luck has not totally run out and some one spots you. They want to help you. They have called the police and/or the ambulance for you. They want to inform your family and friends. Maybe you still have your phone with you. They take it out and try to find the contacts. But its locked. It is asking for a pin code. Now your loved ones will only be informed once the authorities come and do a reverse check on your identification documents or licence plate.
What purpose did lock solve? Do you really have data on your phone more valuable than your own life. I don’t think so.
If you still have a hard time understanding this, imagine yourself on the other side of the equation. Someone you love meets with a tragedy and you are not even informed. Would you be ok with that? I certainly am not.
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