EE Customer in the UK - transferring pay-as-you-go mobile number to new iphone 5?

I'm a customer of EE in the UK. I have a pay-as-you-go plan on an old Nokia mobile phone. Recently I have been given an iphone 5 as a present. My old Nokia mobile has a large sim card. I believe the new iphone 5 has the nano sim card. Can I go to the EE store and ask for a new nano sim card for my new iphone 5 using my old pay-as-you-go plan?

Phone customer services and they'll send you one out