Unless kept unlocked automatically, your phone locks the screen five seconds after the screen turns off.

To increase or decrease the amount of time before automatically locking the screen:

1. Go to Settings > Security and privacy.
2. Next to Screen lock, tap .
3. Tap Lock after screen timeout, then select a duration.

You can manually lock your phone by pressing the Power button. If you want the Power button to turn off the screen but not lock it:

1. Go to Settings > Security and privacy.
2. Next to Screen lock, tap .
3. Tap Power button locks instantly off .

After the screen turns off, your phone will still lock after the time set for the automatic lock.

If you're using a pattern screen lock, make it more secure by hiding finger traces on the screen when you draw:

1. Go to Settings > Security and privacy.
2. Tap Device unlock.
3. Next to Screen lock, tap .
4. Turn Make pattern visible off .

If you're using a PIN screen lock, make it more secure by disabling animations that show when you touch PIN numbers:

1. Go to Settings > Security and privacy.
2. Tap Device unlock.
3. Next to Screen lock, tap .
4. Turn Enhanced PIN privacy on .

To control whether characters briefly display when you enter a password to unlock your phone or log in to websites and apps:

1. Go to Settings > Security and privacy > Privacy.
2. Turn Show passwords off .