So I see that there are some iPad Mini 2 with celluar capability for sale but for different carriers. I've heard that data only it makes no difference as an data SIM card will work with all of them. But I've heard there are differences in the make and compatibility. I've heard that the one for verizon MIGHT be more flexible although I don't use them (overpriced, not worth it.) I have service with TMO and Sprint and wonder if getting any other iPad Mini 2 cellular model, like the one for Tmo with their plan, might be a good idea. Wondering if someone can explain the differences.