Difficulty level:
Medium

What you need:
>Mac OS X 10.5 or later
>Download this carrier settings file from gizmodo.com and double click it to mount it in Finder
>iPhone OS 3.0
>Final release version of iTunes 8.2 (download link)

Notes:
iPhone OS 3.0 will be available to all iPhone users on June 17.

Apple iPhone Tethering

Setting up tethering for your iPhone

Uninstall iTunes 8.2 Mac

1. Drag the Application iTunes from the apps folder on your Mac to the Trash.

2. Launch Activity Monitor from Applications/Utilities and kill the iTunes Helper process.

3. Go to Finder. Navigate to your ~/Library folder and delete the iTunes folder at ~/Library/iTunes.

4. Navigate to ~/Library/Preferences, locate the following three files, and drag each one to the Trash: com.apple.iTunes.eq.plist, com.apple.iTunes.plist, and com.apple.iTunesHelper.plist

5. Empty the Trash

Install iTunes 8.2 prerelease Mac

6. Install the iTunes 8.2 prerelease you downloaded.

7. Connect your iPhone with iPhone OS 3.0 software loaded on it to your computer with the standard USB sync cable.

8. Once the iPhone is connected, go to the Device Summary page in iTunes.

9. While pressing and holding the Option key on your Mac, click the Restore button in iTunes

10. Browse to the mounted carrier settings file you downloaded and mounted above and select the ATT_US.ipccfile. iTunes will now perform an upgrade on your iPhone and display the following message:

Set up tethering on your iPhone

11. Launch the Settings app on your iPhone and go to General and then Network while your iPhone is still tethered to your computer.

12. Locate “Internet Tethering” and turn it on.

If tethering is successful, you will see a message that is similar to the following:

Go into Preferences Network select the adapter as displayed above, and you’ll see something similar to this as it becomes active:

Your iPhone will display a blue background banner on different screens to indicate that tethering is active and running as shown below.

And you’re done!

Please comment with your success, tips, tricks and issues!