So if you want a new 16Gb iPhone 4 with no existing contract it will cost you £169 from Orange on a 24 month contract. From AT&T it will cost $199+tax = $211.94 (approx £143) so it is £26 or so cheaper in the USA. But here is the real cost… the airtime. For Orange the cheapest airtime contract is £30 a month ($44) from AT&T it is $70+tax = $74.55 (£50.32) a difference of $30 (£20.32) a month.
So adding all this up together it looks like it would cost $2,001 (£1,355) to own an iPhone 4 in the US for 2 years, and just £889 ($1,312) in the UK a saving of £466 or $689.
On the assumption that in 12 months time you will be wanting to upgrade to the latest iPhone 5 )or whatever) you have more options in the UK. Again with Orange you can get the same iPhone 4 on an 18 month contract costing £229 and £35 a month for a total of £859 or $1286 making an even bigger saving of £496 or $715.
When all the UK carriers have published their prices and tariffs we will be looking to find the cheapest way to own a new iPhone 4. In the USA it is simple you HAVE to use AT&T and you HAVE to sign up for a 24 month contract. In the UK things are much more open, we have 5 carriers offering iPhones plus you can buy them SIM free and use PAYG tariffs.
