Mobile Device Security:  Not clearing the browser history on your phone can be dangerous.  A phone thief can use your history to hijack your accounts.

Mobile Device Security:  Some Apps that call themselves "free" can actually be disguised data thieves.  Read reviews first and make sure the apps you download are from reputable sources.

Mobile Device Security:  When not using your Bluetooth connection turn it off.  A hacker can gain access to your phone undetected.  Generally, they have to be less than 30 feet away.