One problem a pt told me about his Iphone 4 is the same issue with the Ipad - does not use standard SIM now has micro SIM. My pt. used to use his iphone and when he went to work during the day as a logger he would put SIM in cheap GoPhone that he didn't care if it broke and still have some phone number, etc. Cannot do that now. Interesting that you could move sim between Iphone and Ipad, but I am sure they will find way to monitor how much bandwidth, etc you are doing.
