[/B]There is an app called 2x battery battery saver. It will automatically cut off your 4g while you're not using your data. When your screen is off. But you have to use version 1.43. It is the only 1 that works when you're not using the pro version. Your data connection will turn off. But you will still be able to get text messages. But maybe not MMS. But it saves a lot of battery life.! Data connection automatically turns back on when you turn your screen on. You can buy a newer version but you have to pay for it to turn on and off your data.
its a hard app to program lol. im gonna try this out 