I use Iphone with T-Mobile, currently got a broken screen for 2nd time!
Easy fix and only a fiver on Fleabay for new screen so not so bad!
Anyway i love this phone, so many great features, but my point is this one....
If your happy with your handset, when your contract is up tell your provider that you Do Not want an upgrade and wish to carry on, on a Sim Only contract, I just did this (as Iphone 4 was too expensive) and my monthly bill immediately dropped from £35 a month to £10 a month. Great saving!!!
There is NO such thing as a FREE UPGRADE!! You are buying that handset over two years, eighteen months or however long your contract is. It is much cheaper to buy the phone you want privately and use on a sim only contract, but if, like me, your happy to hold on to your old handset, then you save lots of hard earned money!