Your mobile devices probably contain more private data than you’d like to admit: pictures, emails, phone numbers. All of this can be stolen and copied by hackers. One of the first and most important steps to keeping your phone safe is setting up a lock screen. Also, don’t house ultra-sensitive files like documents with your Social Security number on them in your phone. Instead, back those items up elsewhere. Finally, don’t install any unknown apps. If an app looks interesting but you’ve never heard of it before, do a quick search and learn about it before downloading it.