Some tips if you choose to keep using the P7

-If you have a screen protector turn on screen pro mode (display settings), re-enroll fingerprints

-Use index finger and not thumb for the FP's, sometimes it also works better when you're fingers are more wet, you'll find me sometimes licking them like turning the page on a book

-Turn on smart lock, I have mine setup to not need unlocked whenever I'm at my house or whenever I have my car blue-tooth connected, with those two enabled I don't need the FP unlock as much anymore

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Overall the FP sensor is shit on p7 compared to the back FP unlock on older devices (came from a 4a).I'm not a fan of face unlock (just feels creepy) and wouldn't use it regardless of which device I'm using, but to each their own, good luck!