You can use your Android phone screen lock as a screen lock for Signal. If you choose a pin, passphrase, or fingerprint lock for your Android phone, this same method will be available for Signal's screen lock.
To enable a screen lock on Signal Android
- Enable a screen lock on your Android phone.
- Open Signal.
- Tap on the Menu or .
- Choose Settings.
- Choose Privacy.
- To Enable: Tap Screen lock until it slides right and shows a blue color.
- To Disable: Tap Screen lock until it slides left and shows a white color.
If you've enabled a screen lock then you choose to lock Signal Android automatically or manually.
- To lock automatically
go to Signal > Menu or > Settings > Privacy > check on Inactivity timeout passphrase and adjust the Inactivity timeout interval to 1 minute or longer.
- To lock manually
swipe down from the top of your screen to view the notification tray. Tap on Lock Signal. If you do not see this option, swipe down on the Signal is unlocked notification, then tap on Lock Signal.
Learn how to set up a screen lock on Signal iOS.