It began with O2 exclusivity but now most of the major UK carriers sell the iPhone, Three has just been added to that list of carriers which is an intresting move. Three usually offer very good deals and make the devices very cheap so we could possibly see a cheaper iPhone 4 from Three.
All the carries have confirmed that they will be selling the iPhone 4 from June 24th so it’s going to be an interesting launch and a strong amount of competition.