I am thinking of purchasing an ipad mini cellular version on ebay .... does anyone know if there is a difference in quality or if one is different in any way .... My reasoning is i once bought an samsung galaxy s2 and found out it was cdma after the fact, so it was limited out of the US ..... so i am asking to insure as best i can are there any different things about an ipad mini , by any 3 providers , sprint, at@t ,or verizon i should know ? It is not going to be used in the us much so choosing the cellular to change sims in different countries is my priority thx