I've got my iPhone on release day, been finding deal pixels, and so finally exchange that unit today at my local Apple store. They swapped out my original sim card into the new unit and I was on my way home. When I got home, I hooked up the new iPhone to my MBP, iTunes took me through the activation and service agreement pages again! It asked for my wireless number, zip code, and have me agree to a 2-year agreement. I already agreed to a 2-year contract and so do I have like total of 4 years contract with this new unit? Any of you had this experience after exchanging your iPhone?