And then there were five! UK carrier Three is the latest to announce they will be offering the new iPhone 4, though like Orange, T-Mobile and Vodafone they're yet to confirm any pricing or tariff details. A preview page on the Three website allows would-be buyers to sign up for more details as and when the carrier confirms them.
So far only O2 has announced any details as to upgrade offers; they'll be giving existing contract customers the chance to buy out their current agreement for £20 per month remaining. They'll obviously also have to pay the price of the iPhone 4 handset itself, which is another detail yet to be announced in the UK.
iPhone 4 hands-on: