When you don't use your android phone for a while time , automatically the phone will locked there are many different ways to unlock the android phone and that stand of the phone but the most of the android phones the center button is the main button to wake up the phone ! and then you could unlock it .
If you want to change your screen lock move to Locations & Security from the settings then move to Screen Lock and change your lock screen .
If you want to change your screen lock move to Locations & Security from the settings then move to Screen Lock and change your lock screen .
