@mr_goodbar wrote: My question is can you tether with the iPhone 3G ? (not 3GS) or this feature not available for it? And if it is what iOS should it be running?
As long as your iPhone 3G is running iOS 4.0 or later, you'll be able to tether your iPhone to another device over USB or Bluetooth. The "Personal Hotspot" feature is not available on the iPhone 3G. You'll need the $45 4GB Data/Hotspot Data Plan to activate/use the feature.