Can I put my current SIM card in an Iphone 5?

I may be getting an iPhone 5 soon, and I have seen in a few places that people just buy a sim cutter and trim their sim down to a micro sim size and put it in their iPhone. Can I do that? I used to have an old Samsung, then an old blackberry and that broke so i'm using an old Nokia ATM. I'm on Vodafone and i have a pay monthly deal i think but i don't have upgrades or anything like that! I'm going to buy an iPhone either unlocked or one that it locked on Vodafone (i won't be changing). Usefully info is welcome!

I had my sim cut down in the market the other week. It cost me £1.00 and works fine.

Yes you can just get the sim cut in some where like car phone warehouse

Hope this helps

Just go to the store ar eget a replacement one and follow the guide in my source