The most impressive feature of the iPhone 5S is the Touch ID fingerprint sensor. It is a convenient security tool that makes it easier to unlock the iPhone, compared to using a 4-digit PIN code. If you use a 4-digit PIN code, Touch ID will be convenient. It also allows purchases from iTunes and the App Store without having to type in your Apple ID password.Setting up Touch ID is fairly straight forward. Just go to Settings > General > Touch ID & Passcode > Touch ID, then go through the fingerprint enrollment procedure. Here are some things that you should remember.
1.Scan your finger upside down, if you want. When you enroll your fingerprint, the directions make it seem as if you have to line up your finger in a certain orientation, but in reality, the Touch ID sensor has 360-degree readability. So, you can easily enroll your fingerprint in the opposite direction.
2.Five fingers max, but use less for performance. You can store up to five fingers in Touch ID, but remember that the more fingerprints you store, the longer it will take Touch ID to identify which finger you’re scanning. Just one finger print gives you enough protection.
3.Recognize your finger easily. If you enrolled multiple fingers, but didn’t label them, you can easily identify which is which by scanning them in Touch ID Settings. When you scan one of your fingers, the matching print will briefly be highlighted from the list.
4.You have five tries, not three. When attempting to unlock the iPhone 5S, you’ll get a passcode prompt after three failed scan attempts. You can choose to enter your passcode here, but you actually have two more attempts before you’re forced to use your passcode.
5.Cover the home button. Touch ID is supposed to learn and gradually improve its recognition of your fingerprints. However, if you’re having problems with consistency, make sure you’re covering the entire home button. The feature works much better when you cover it completely.