3. Use a real password instead of a digit code

The default way of unlocking a phone from the lock screen is by using a 4-digit PIN. As long as it is not super easy and obvious, this is a pretty safe system. But to make it even more secure, you can change this to a set string of characters of your choice, making it more like a password.
iPhone instructions:
Enter Settings, and go toPasscode. Swipe off the option that says Simple Passcode.
Now you can set your passcode to any combination of characters.
Android instructions:
Enter Settings, and go to Screen lock. Here, you can select which level of security you want from the options.
Tap Password and create the password you want, using any characters.
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