I know there is a thread asking about it, but it deserves its own so people dont waste 6 bucks. The app works as advertised. When you lock the phone it will switch to edge, and unlock it will switch to 3G. What it doesnt tell you is the fact that the phone needs about 20 seconds to gain a 3G ip address, so you wont be able to use it for 20 seconds after you unlock your phone. Just keep it charged and save your money!