iPhone Tethering in US
I wonder if this works.
HOWTO: iPhone AT&T Tethering
============================In 10 steps:
* Update iTunes to 8.2 via Software Update
* Update your iPhone to the 3.0 release (out today – June 17th)
* Download this dmg and mount it: tethering file
* Enable hidden carrier testing option (in Terminal.app): defaults write com.apple.iTunes carrier-testing -bool TRUE
* Start up iTunes
* Go to you iPhone’s summary page
* Option-Click the Restore button
* Select the ATT_US.ipcc file from your mounted dmg (step 3)
* Open Settings -> General -> Network -> Internet Tethering on your iPhone and switch it ON
* When your computer is connected via USB you will see a dialog to open network preferences. Open it and hit apply.If you have problems with visual voicemail after this follow these steps (thanks to [luigi](http://github.com/luigi) for pointing this out):
* Connect your iPhone and fire up iTunes
* Option-click on the Restore button like you did before
* Navigate to [your-username]/Library/iTunes/iPhone Carrier Support
* Click on the file in there to reset your carrier settings
