Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)
The iPhone 4 will come with it's own sim. You just need to transfer service from your old phone to your new phone which you should be able to do from iTunes. No need to mess with sims.