Can i ask Vodafone for an iphone Sim?

I have recently started a 24 month contract with Vodafone in the UK, with a Samsung galaxy s2 included in the monthly price. After 2 months of use I've decided i'd prefer an iphone 4. I planned to simply buy an iphone and put my current Sim card in it but heard it uses a smaller Sim card. Would i be able to ask Vodafone to transfer me to a mini Sim card or would they take the view that i have to stay with the s2?

Theyll justgive you an iphone sim

Yes i'm sure they do have a sim for you iphone

It may cost you 10 pounds to buy a new SIM.
but yes, you can have a new SIM on the same contract.

for 3-4 pounds you can also get SIM card cutters off ebay
http://www.ebay.co.uk/...&_from=R40
and you may even get a phone stall to cut it for a small fee also.