How to enable internet tethering on a UK iPhone
We ran a poll on Bitterwallet before asking how many of you had jailbreaked (it's a verb right?) your iPhone. The majority had so we suppose there's also a good lot of you who use a software unlock solution.
If you are running an unlocked iPhone 3.0 on an alternative UK network you may have a problem getting the internet tethering option to display in your iPhone settings (if you are on o2 read the HUKD iPhone tethering thread). Fear not, as there is an extremely simple solution!
The use of ipcc files to change your carrier information was the widespread hack during the 3.0 beta days but now that iTunes 8.2 is fully released you can no longer easily overwrite your ipcc file to trick it into tethering and MMS (there are still ways around that). The far simpler solution to enable tethering is to use the iPhone .mobileconfig files which can turn on tethering painlessly.
The .mobileconfig file is usually used be enterprises to quickly configure mobile phones with permissions and carrier settings (like your data APN). Luckily they can also switch tethering off and on. To use the .mobileconfig file you only need to click on the attachment in email or visit a webpage which holds the file.
Without further ado here are .mobileconfig files for several of the UK operators. Either download the relevant one to your desktop and then email to your iPhone (click the attachment in email) or visit the file url in your iPhone Safari browser. This will trigger a page that asks if you want to enable the Profile, click install and that's it. You can always go to Settings -> General -> Profiles to turn it off. Once you have the profile installed go to Settings -> General -> Network to enable Internet Tethering.
Three.co.uk tethering settings - http://tiny.cc/3tether
Vodafone UK tethering settings - http://tiny.cc/vodtether
Tmobile UK tethering settings - http://tiny.cc/tmobtether
Virgin UK tethering settings - http://tiny.cc/virgintether
EDIT: Not surprisingly, it looks like o2 have got wind of this clever little hack and are kicking up a bit of a stink about it. They're threatening to charge or disconnect any users who don't fork out for the official bolt-on. More at Macgasm...