One of the Carriers in the UK found a unique way to discourage Jailbreaking. That is the carrier O2.
How are they discouraging jailbreaking? Are they sending out emails saying if you tether they will automatically bump you up to the tethering plan and kill your unlimited plan - No that would be evil and I could not imagine anyone actually doing that.
No what they are doing is letting you tether for free.
What kind of bizarro world do you live in in the UK that your Carriers are kind of you know not Evil. Must be nice. Rugby, Shepards Pie and Free Tethering - Yup the UK is the place for me. Some details:
Tethering is now completely free. If you have a 1 GB data allocation, then it doesn't matter if you use that data on the phone or on a connected device -- it's all charged the same.
Yup a very strange world indeed.