Swapping your sim card from a htc to an iphone 4?

I have 6 months on my contract with a htc phone and i was offered an iphone 4 for free. I want to swap it across but i know the iphone 4 has a micro sim or something like that.

does anyone know how to transfer a normal sim to an iphone 4 sim card? Because i want to keep my number?

do i have to go to an iphone shop or do i cut it myself?

You have to go to AT&T (assuming there your carrier) and get a micro sim and have it activated. Mine was free, but I knew the kid working there, so you might have to pay some $$ to get it and have it activated

You can either go to the shop and get a microSIM with the same number you presently have or you can trim the current SIM to microSIM. There are lots of tutorials available on this.

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