Smart Lock automatically unlocks the device when trusted locations (work, home) or other devices (Bluetooth® headset, NFC tag) have been detected.
A secure lock type (PIN, pattern, fingerprint, etc.) must be set up for Smart Lock to be available. Turning off the secure lock also turns off Smart Lock.
From a Home screen, swipe up to display all apps..
Navigate: Settings > Security & location .
Tap Smart Lock.
Enter the current unlock method (e.g., PIN, pattern, etc.).
Select any of the following available options then follow the onscreen instructions to set up a trusted unlock:
For more info on Smart Lock (editing, removing settings, etc.), refer to this Google™ support page.
On-body detection: Keep your device unlocked while it's on you.
Trusted places: Set locations (home, work, etc.) to keep your phone unlocked whenever you're there
Trusted devices: Set Bluetooth or NFC devices to keep your phone unlocked when that device is connected