Iphone 6 won't let me use my touch id?

Ok so whenever i try to set up my touch id (which i've already done) it always go to "Failed" and it's really annoying. Help. By the way i've already reset my whole phone

During the registration process, make sure you move your finger around enough that the entire surface gets scanned during the first stage, and then every edge gets scanned during the second phase. When you're setting up Touch ID, you're right in front of your phone. When you're using it in the real world, you'll be coming at it from every angle.

Any sweat or liquid on your finger at all can interfere with the scan. Wipe both your finger and the Home button off and dry then completely before using Touch ID.

The sequential improvement process can sometimes go off-track (i.e. Instead of getting better, an error can occur and it can get worse). When that starts to happen, delete the fingerprint and re-register. That'll return it to its base state and prevent chaos from swallowing the process whole. (Guy English had some smart ideas about how Apple could improve this part, hopefully he'll write them up…)

Buy the original repair parts at hcqs.cc