Listen guys, if you are thinking of getting an Apple Iphone for yourself and you would like to downgrade after certain months, think twice before taking a contract from Vodafone UK though. I have read on the Vodafone's forum that Vodafone will not be able to downgrade an Apple Iphone's contract even after 12 months of usage. This was in contrast of what I was being told over the telephone when I was trying to make an enquiries for my friend who wants to get an Apple Iphone 3GS.
I have persuaded him to get the Nokia E72 or the N900 as he is quite in tuned with today's technology but he was more interested in the Apple Iphone 3GS even though he knows that a new version of the Iphone will be released in the summer.
If you want to take up an 18 months contract, try O2 or Orange but definitely not Vodafone. T-Mobile UK will only offer their Iphone contracts to existing customers and they will NOT allow any tariff downgrade after 9 months or 12 months.
However, if you are on TescoMobile, you would only have two choices. Either you are on the £20 a month for 12 months (you would have to pay £320 towards the 16GB 3GS handset) or £60 a month and the handset will be free. There is a catch though. With the handset go free, you will have to endure it for 24 months!!!
Take a pick!