Just a warning, do not break the touch ID button on an iPhone 6, then get it repaired by a non-Apple phone repairer. The touch ID is paired to the SOC on the iphone. If it's broken you can't use fingerprint, get iOS updates or do a recovery. Only Apple can fix this apparently (for a "small" fee).
I think iOS 9.x is the main culprit here.
Edited by Jeruselem, 08 February 2016 - 12:07 PM.