Click on Menu button on homescreen and tap on Settings.

Tap on Security.

Under Screen Lock, tap on Set up Screen Lock.

It will show you different types of locks you can use: Pattern, Pin and Password. In PIN lock, you can use any set of numbers as your pass code. You can use the Password option by setting an alpha numeric combination.

Enter the pin you want to use and tap on Continue. It will ask you to confirm it again.

After you’ve enabled the Pin code lock, tap on Lock Phone in security settings and set it to Immediately. This ensures that your phone is protected with the security lock as soon as you press the power key.

Now you’ll need to enter your password any time you need to unlock your smartphone.

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