Touch ID, in our experience works perfectly. However, not everyone is as lucky. Some users say they are experiencing problems. It doesn’t always read their finger correctly. There’s an easy fix for that.
The best way to improve the accuracy is to create multiple fingerprint profiles, but with one finger. For instance, if you are using your index finger, create multiple scans for that index finger. This will help with accuracy, as it can identify that single finger as any one of its multiple profiles.
Most of those who came up with that idea say that it really helps improve its reliability. Some have gone up from about 50 percent to over 90. Others say that it works almost every day.
[via Huffington Post]