[fred cook]

Don't know about the need for an anti-virus app, but I found one called "Lookout"
that has a couple of neat features. First it does offer malware protection, secondly it has an easy to use backup feature, and best of all is a "Missing Device" feature that should your phone be lost or stolen allows you to track it via GPS, lock it down, cause it to "Scream" and if needed, wipe it clean, all from another phone or computer! These features work even if the lost/stolen phone is turned off. There is a free version and a "Pro" version that costs a couple of bucks. Not too bad a deal for a phone that would cost $3-400 to replace.