Well currently i have my o2 payg sim in my iphone 3.0 and i updated my carrier settings with the o2 ipcc file that downloaded. After abit of playing with terminal i got itunes 8.2 to accept the file i ran the command
defaults write com.apple.iTunes carrier-testing -bool TRUE
Which allows you to add the custom ipcc file to your iphone, so you can tether without an offical tethering account. But now I'm looking for a file for t-mobile UK so when ultrasn0w comes out i can tether using my t-mobile account, I've found the ipcc for most networks but not t-mobile uk.
