Originally Posted by mlass
The information I have read says that the SIM tray is on the TOP of the Phone and a Paper Clip will be needed to remove it. As for the design of the Sim Card it has not been confirmed. It is said to be a different design and will not fit in other phone.
I think this is just to discourage people from using the iPHone on other accounts.
I'm pretty sure the SIM card will be a standard SIM card. It might come pre-installed, but a simple press of a straightened paper clip should allow you to swap out your active SIM and put it in your older phone when you're going water skiing with your buds.