Yes, I have used the iPad mini Sprint model (1st generation) on AT&T Wireless and T-Mobile. LTE works just fine as well with the 2 carriers
So Sprint LTE iPads are now unlocked?
From all I've read, all iPads are unlocked.
The advice here at MacRumors, is to buy the Verizon model because you would not be carrier hamstrung in any way.
I'm actually looking to by one an noticed them on eBay
I assumed you were buying on eBay. A Sprint iPad mini will work on AT&T. If you eventually plan on selling the device, a Verizon iPad would probably be better since it has a slightly higher resale value.
I was just curious if It work if purchased for another network an get LTE
I think it's a first gen mini