How To Increase Battery Life of iPhone 4/iPhone 3GS/iPhone 3G

If you are one of those heavy users, and want to know the tricks to increase the battery life of iPhone then a tweak named Auto3G could be of great help to you. Auto3G is based on a very simple idea. It just turns off the iPhone’s 3G radio when it is locked, and turns it on when phone is unlocked. Hence, saving a lot battery power for later use, in fact, it almost doubles the battery life.
Auto3G doesn’t have useless customizations and complicated features. However, it provides necessary option like 3G Timeout settings. Auto3G is available in Cydia via BigBoss repo for $5.99, which i feel is bit on a higher side. But still, it is a good idea than investing in a case with battery, which costs much higher.
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If it saves the battery life then I am waiting for its reviews.