With iOS 10, the iPhone 7 and 7 Plus require you to press the home button while using Touch ID. If you prefer to go back to the olden days of simply resting your finger on the sensor to unlock the phone, good news: the feature is buried in Settings, just waiting to be enabled. (In fact anyone with a phone that supports Touch ID, from the iPhone 5s onward, can take advantage of this setting.)
Here's how to enable the option to rest your finger on Touch ID to unlock your phone:
1. Open the Settings app.
2. Tap General.
3. Choose Accessibility.
4. Select "Home Button."
5. Tap the "Rest Finger to Open" switch.