You may have accidentally called 911 and hung up. You have to call 911 back simply explain that you made a mistake and they'll remove it from your phone through your number. Another reason would be that you either have a sim locked phone from your service provider and there is a different sim card from another service provider installed. You'll have to unlock the phone. OR your phone is locked for security reasons. A person can easily lock the phone in settings and apply a password to unlock the screen to access the phone. All of the above will give you the sceen you decribed.
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