I locked my Galaxy S6 and unlocked automatically without using a screen lock type.
If you locked your device but it seems to have “unlocked” itself please check whether Smart Lock feature is enabled.
Smart Lock feature supports the unlocking of your mobile device (without you needed to unlock the device using the screen lock type you activated) when trusted locations or other devices which have been registered in advance have been detected.
Smart Lock is new feature implemented by Google since Android OS 5.0 Lollipop.
In other words, via Smart Lock feature if you register trusted devices such as a Bluetooth watch, your car’s Bluetooth system, an NFC sticker on the phone dock in your car, the Galaxy S6 will go to unlocked state when connected to trusted device.
Note: This will mean your device will be unlocked while it is in range of the Bluetooth signal of the device.
Similarly, you can add trusted locations through Google Maps and device will keep unlocked state within the locations.
At that time, your Galaxy S6 is unlocked without using a screen lock type except just dragging the screen. You are able to enable Smart lock after setting one of the Lock methods such as PIN, Pattern, Password or Fingerprints lock type.
Enabling Smart Lock
When a screen lock type is set, you can check or enable the Smart Lock feature.
From the Home screen, touch Apps > Settings > Lock screen and security .
Touch Secure lock settings > Smart Lock. Then choose between 2 options: Trust devices, or Trusted places.
Trusted devices - Add a trusted device to keep the device unlocked when connected such as your car's Bluetooth.
Trusted places - Add a trusted place in Google Maps to keep the device unlcoked when you are in the trusted places.
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