I'm thinking of upgrading to an iPad Air (AT&T), and giving my iPad 3 (Verizon) to my parents. I've read a number of old threads from when the iPad 3 first came out about the fact that a Verizon iPad 3 will work on AT&T's network using an AT&T sim (presumably, "4G"/non-LTE), and I'd love to add my parents to my AT&T mobile share plan or just have them buy the 1GB/3-month plans from AT&T (assuming it would work with a Verizon iPad 3 with an AT&T sim). They don't need LTE speeds; they barely need cellular connectivity, but it would be nice. Can anyone confirm whether a Verizon iPad 3 can still be used on AT&T's network? Does anyone use one on the new 1GB/3-month plan? Many thanks for your help!