Check them out in the App Store guys. They work seamlessly with your device and with each other. One allowed you to install a VPN on your phone that can compress data and the other allowed you to see how much data you've used and how much you've saved. I've been using them for a whole now and so have my friends. They've saved a lot on their capped data plans (one girl saved 200 mb from her 1gb data plan) and just by installing the app.
