My Galaxy S5 fingerprint scanner wont work and now asking for back up password but that wont

[AC Question]

my galaxy S5 is locked with a fingerprint. i went to unlock my phone and it wasnt working, then my screen changed to just my backround picture, it says Enter Password where the backup pin password would be and then emergency call button. i have recently discovered that i can receive calls and when im on the call i can see the message icon where someone had text messeged me but i cannot get into the phone whatsoever.

 

[the tall guy]

Have you tried Android Device Manager to unlock the phone, or speak to your carrier, they'll show you how to unlock it.

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