So here is a little Android app that enables the 2G only setting automatically when the phone is asleep to save battery. It’s not polished at this point, just trying out the features and come up with more to add.
How it works:
- You can get 2G coverage in all the places that you have 3G coverage
- 3G uses more battery power than 2G
- You don’t “need” 3G data when your screen is off
- Turning off 3G data when your screen is off should save you battery life