The latest release of the iPhone firmware has the option to turn off 3G. You would want to turn off 3G when you do not need it and revert to GPRS/Edge to save battery life. Hopefully the 3G iPhone 2.0 will be released in June.
Latest 2.0 Beta iPhone Firmware Hints 3G iPhone
May 11th, 2008 by Limited Edition iPhone · 1 Comment
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iPhone 3G Enabler Screenshots Confirmed Fake // May 23, 2008 at 7:28 PM
[...] it’s been discovered to be a pretty good fake. The now-infamous “Enable 3G” screenshot purportedly taken from a recent iPhone 2.0 firmware beta was mocked up according [...]