One of the standout features from Android 6.0 Marshmallow is the fingerprint API. It allows Android devices to take advantage of built-in fingerprint scanners have a higher level of authentication for purchasing apps, submitting transactions, and securing a phone or tablet.
First off, you’ll want to head into Settings and locate Security. The process will be the same whether you have a Nexus 6P or Nexus 5X. If you’re in the correct place, the fifth option from the top should read “Nexus Imprint.”
Once you select that option, your device will make you agree to the terms that follow. Then you’ll be asked to provide a backup password, PIN, or pattern. The next step is when you’ll scan your finger. For both the Nexus 6P and Nexus 5X, the sensor is mounted on the rear side of the device in a little circle just below the camera. On-screen prompts will help you to locate it. Now you’ll have to place and lift up your fingertip on the sensor multiple times while varying your finger placement slightly each time. This ensures the device captures the best possible image so that you can scan your finger quickly and accurately without any issue. For me, the fingerprint scanner on the Nexus 5X seems to register correctly almost always and has been more reliable than the majority of competitors.
Once you’ve added your fingerprint you’ll be good to go! You’ll also have the option to repeat the process and add another finger (but no more than five) and even give a name to each finger added. You’ll notice the addition right away on your lock-screen. Near the bottom you’ll see a small fingerprint icon indicating that your device can be unlocked with your fingerprint. You can also use your backup password, PIN or pattern at anytime by swiping up from the bottom of the lock screen. Google occasionally asks for your backup security method (the password, PIN or pattern) when booting up your smartphone for the first time.
One of the best things about Nexus Imprint is that you won’t even need to touch the power button prior to unlocking your device. When the device is on standby, you can wake it by placing your finger on the sensor to bypass the lock screen altogether. Google says that everyone’s fingerprint is secure and not shared with anyone; therefore, your data is kept safe at all times.