I want to transfer my existing unlimited data plan from one SIM to another. I had already purchased a 3G iPad and set up the unlimited data plan last week. I ended up getting a new iPad (not open yet), and I'm wondering, when I restore from the iTunes backup, will data already be set up, or will I have to go through some activation process again? I'm worried about losing my grandfathered unlimited plan (or getting charged twice) through some sort of repeat activation process. I know that I could've swapped SIM cards, but I am no longer in possession of the previous iPad. Will this be a problem?