Gues
s what? The more you use your iPhone, the faster its battery drains. This is hardly a surprise. Further, certain iPhone features require a bit of extra power and will drain the phone's battery even faster. Again, not much of a surprise. It's simply a matter of physics. Still, it's worth pointing out exactly what these battery-eating features are. It may be of particular interest to iPhone 3G owners, many of whom claim that the 3G's battery life is significantly shorter than that of the original iPhone.
Check It Out: The Long and Short of the iPhone's Battery