If you're worried that your privacy will be compromised by your phone not being protected enough, you can consider a blocker app to ensure access to your device. Maybe Screen Lock: Time Password is what you are looking for.
Protect your Android with a PIN, pattern or password
There is nothing wrong with adding a layer of security to the one Android already has . This application will allow you to do so, by setting a PIN code, pattern or password to access it. You can also use it in specific applications, such as your social networks, your messaging applications or your photo gallery. It is a very easy to use application that offers the following features:
- iPhone style lock screen.
- Customizable lock screen.
- Unlock ringtone.
- Ability to set a lock PIN code based on the current time dialed by the device.
- Set access passwords.
The point is, we have to say it, this isn't the best locking app: too much advertising and a slightly confusing interface in some ways. You might prefer other options that you can find on Malavida, like AppLock, Norton App Lock, or Smart AppLock.