Mobile security means making sure your phone and the information in it are safe. To stay secure, you should use a password or passcode to keep other people from just opening your phone. You should also be careful to NOT click on links or install apps sent to you by people you don't know - they might contain malware that could harm your phone and steal your information, like the websites you use and the passwords you type. Finally, you should turn on the option to find your phone if it gets lost - this way you can track it in case it gets lost or stolen.