Iphone free upgrade on t-mobile?

Delight

New member
Hi. I'm due for an upgrade next month (january 2011) with T-mobile. I'm on the Flext 35 tarriff which is £35 but i didn't upgrade last year so i now pay £22 a month. I want to upgrade to a iphone 3gs or iphone 4. Do they offer iphone upgrades and will i be able to stay on my current tarrif or at least my current monthly payment? Has anyone upgraded? And if so which is the best iphone to go for, for example which internet usage size is better? And 8gb or 16gb?
 
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