The iPhone 3Gs’ battery life is either terrific or terrible, depending on your point of view. When accessing the 3G network, it gets longer battery life than any other phone—and yet that’s only 5 hours of talk time, compared with 8 on the original iPhone.
But never mind all that; the point is that if you’re not careful, the iPhone 3G’s battery might not even make it through a single day without needing a recharge. So knowing how to scale back its power appetite could come in extremely handy. The …