I'm looking to pick up a couple of iPad Airs and Minis for work, and was wondering if anybody knows whether the Verizon model will be the most flexible, like it is for the iPhone 5S? In other words, we purchased Verizon 5S's, even to use with AT&T service, since they're unlocked for LTE. Would it be the same case with Verizon iPads? This way we could just purchase one model-type and use it for any carrier... In other words, is there any reason to get an AT&T model?