3G technology gives iPhone fast access to the Internet and email over cellular networks around the world. iPhone 3G also makes it possible to do more in more places: Surf the web, download email, get directions, and watch video — even while you’re on a call.

 

Iphone 3G
3G has great battery life on iPhone. 300 hours of standby, 2G talk-time now has 10 hours (as opposed to 5), 5 hours of 3G talk-time (most phones only have 3 hour 3G talk time), 5 to 6 hours of high-speed browsing, 7 hours of video, 24 hours of audio.