I'm thinking of selling an iPad 1 and giving my parents my iPad 3, and then upgrading to the Air. Any insights on the following would be greatly appreciated: (1) The iPad 3 is on Verizon, and I'm currently on the pre-paid $30/month plan. I recall, when I first got it, that if you stopped the plan for more than 5 months or so, Verizon would cancel the SIM. My parents will rarely, if ever, use the cellular feature, so they may just cancel the plan. Does Verizon still cancel the SIM? I have couple of extra SIMs in case, but wanted to find out. (2) Is there a difference between the WiFi only Air and the cellular version (other than the cellular capability and price, of course)? I rarely use my iPad outside of a WiFi signal and am thinking of saving money by tethering it to my iPhone 5S when needed (otherwise, I'm spending at least $120/year to include it in my AT&T mobile share plan). I recall that earlier wifi-only versions did not have the gyroscope or something like that, but am not certain. Many thanks!