“How to Turn Off 3G?” Is this author mad? Everyone’s paying AT&T a lot more money for the privilege of getting 3G. Why on earth would you want to turn it off?
Because 3G is a power hog; it cuts your iPhone’ battery life in half. Therefore, be grateful that the iPhone even has an on/off switch for its 3G radio; that’s a luxury most 3G phone owners don’t have.
You might consider turning off 3G when, for example, you’re not in a 3G area anyway, or you’re not using the Internet. You could turn it off when you have a long work day ahead of you, and you can’t risk running out of juice halfway through the day. Or maybe you’re getting the “20% battery left” warning, and you’re many hours away from a chance to recharge.
Turning off 3G forces the iPhone to use the older, less congested AT&T network, which sometimes means you can complete a call in a crowded place where a 3G attempt would fail.
In those situations, from the Home screen, tap Settings→General→Network; where it says Enable 3G, tap to turn it Off. Now, if you want to get online, your phone will use only WiFi and the slow EDGE network.
Learn more about this topic from iPhone: The Missing Manual, 4th Edition.
The new iPhone 4 and iPhone 4.0 software have arrived, and New York Times tech columnist David Pogue is on top of it with a thoroughly updated edition of iPhone: The Missing Manual. Each custom-designed page helps you use your iPhone for everything from web browsing to watching videos. The iPhone is packed with possibilities, and with this handy book, you can explore them all.