cannot use touch id

Have you tried removing all the fingerprints that are saved? Then add it back one at a time.

Did you upgrade the phone or anything recently, or did it just stop working suddenly.

Yes, https://www.apple.com/retail/geniusbar/

cckkyaya Said:

"cannot use touch id: I already try what apple support said, but still I can't use my touch ID on my iphone 6 and it's the latest version on the phone. the screen still show faild."

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Refer to the link provided atop this post.