How to get a nano sim card from orange?

I'm currently on an iphone 4s orange contract, but i will be purchasing an iphone 5. Will i be able to get a nano sim from orange?
and how would i get 4g, would i have to transfer to EE (if i'm even able to)

By 'nano' do you mean 'mini'! Went I went to a Nokia Lumia phone, I contacted my provider, (o2 Ireland). I was told that there was no problem and they would either put one in the post or I could visit the local store. I went to the store and they not only provided one there and then, but transferred everything over for me. I think o2 have the best customer service of just about any company I have had dealings with - probably why I have been with them 10+ years! Ring Orange customer service and ask them what the procedure is.