Do you follow the security advice from experts and keep a passcode for locking your phone, or do you prefer not to have one? It bears repeating that without a passcode, personal information on your phone can be accessible to anyone who might find it — and could even make the phone easier to steal. If you are worried that a passcode could make it difficult for someone who might find your phone and want to return it, you can always enter a message in a text app with a family member or good friend’s phone number, take a screenshot of the page and save it as your lock-screen wallpaper.