The success rate for me is about 10-20%. I've re-registered my prints at least five times, including the 7.0.2 update. It always works great just after registering, and then within an hour or less it's back to failure. I think this has nothing to do with any specific period of time, I think this sensor easily fails as your fingers change in some minor way -- humidity, oils, dirt, etc. At least that's been my experience, perhaps we all have defective sensors with this first batch of phones.
I'm extremely disappointed and don't understand why reviewers were saying it works perfectly. I'm about ready to just turn it off and use a passcode again, because it's causing way more frustration and wasted time.
I'm extremely disappointed and don't understand why reviewers were saying it works perfectly. I'm about ready to just turn it off and use a passcode again, because it's causing way more frustration and wasted time.