For $3.99, an anti-virus app on the Google Play Store promised to scan apps, files, media and settings in real time, ridding your phone of harmful material and speeding it up with no effect on your battery life and no pesky ads to ruin the experience — all at the touch of a button. No fancy animations of your phone being scanned, no settings to master, no added battery task manager, just easy anti-virus functionality, pure and simple.