Unlocking phones with fingerprint is a feature which does not come with all phones what makes a group of users they experience a series of false applications in Google Play for this function, and certainly when you experience them , you find that they are not effective, but there is one exception will give this feature and makes your phone away from snoops , the application ICE Unlock Fingerprint Scanner .
ICE Unlock is a real fingerprint lock screen that locks and unlocks your mobile device securely.
ICE Unlock is powered by ONYX which allows users to take a picture of their fingerprint using the existing camera. No additional hardware or scanner needed.
* NOTE: ICE Unlock requires a rear-facing camera with flash, and the camera has to be able to focus on your finger. Many devices that do not focus on close objects do not work with ICE Unlock, and are marked not compatible.

Quote from Tom's Guide: "Bitdefender's Clueful app, which rates the privacy risks of apps installed to your phone, gives ICE Unlock a "low risk" application, which means it has far less access to your phone's functions than apps such as Facebook or Twitter."
USING THE APP - The user places their finger into the rear facing camera field of view. Then the user takes a picture by tapping the screen and ICE (Identity Control Essentials) UNLOCK processes and matches the image and unlocks the device.
TOUCHLESS FINGERPRINT AUTHENTICATION JUST WORKS BETTER!
Touch-based sensors, like the one on the iPhone 5s, aren’t as accurate, are subject to wear and tear, and have a tendency to distort your fingerprint due to the pressure applied. The touchless ONYX technology used in ICE Unlock can provide higher levels of accuracy than required by the U. S. Federal Bureau of Investigation.ICE Unlock – THE FIRST MOBILE APP BUILT ON THE ONYX HD AUTHENTICATION ENGINE.
The ONYX Engine is what does all of the behind the scenes processing, encoding, and matching for ICE Unlock. ONYX is designed to run mobile touch less fingerprint authentication on Android, iPhone/iPad, and Windows mobile devices to bring biome tric security to enterprises. ONYX shows its flexibility by also powering applications like ICE Unlock.- If you are requesting support please include the model of your mobile device.
* ICE Unlock currently has some known workarounds due to the way android devices handle lock screens . ICE Unlock is not intended to be used as a sole source of security. If you require an extremely high level of security we recommend you additionally implement other security measures such as the pin, pattern, voice, or facial recognition lock screens native to the android operating system.