This shows to enable internet tethering on iPhone OS 3.0 using AT&T’s network.  I tested it.. And It works!

First, let’s enable IPCC updates on iTunes 8.2.

Mac OS X:

1. Close iTunes if it is open
2. Start Terminal (Applications > Utilities)
3. Run the following command: defaults write com.apple.iTunes carrier-testing -bool TRUE

Windows 2000/XP/Vista (32-bit):

1. Go to Start -> Run (
2. type in “command” and hit enter
3. Type/copy+paste this into the command console that comes up: “C:\Program Files\iTunes\iTunes.exe” /setPrefInt carrier-testing 1
4. Hit enter

Windows XP/Vista (64-bit):

1. Go to Start -> Run (
2. type in “command” and hit enter
3. Type/copy+paste this into the command console that comes up: “C:\Program Files (x86)\iTunes\iTunes.exe” /setPrefInt carrier-testing 1
4. Hit enter

There, now you can update IPCC files as you were able to in 8.1. Now, let’s go get us some AT&T Carrier Bundle goodness. You can download the modified bundle right here. To install this, follow these steps.

1. Download this file to some location on your computer
2. Plug in your iPhone
3. Start iTunes
4. Click on your iPhone in the device listing in iTunes
5. Alt-Click the “Update” button (Shift-click in Windows)
6. Browse to where you saved the IPCC you downloaded
7. Select this file and click Choose
8. Wait…
9. Rejoice!