If you are getting the wifi-only model, then you can buy it anywhere. If you are getting the cellular version, then you have to get a model that will work with the cellular carrier you will use. While you don't necessarily have to buy it in your country, figuring out which models work with which cellular company can get tricky. For instance, in the U.S., there's the Verizon, AT&T and Sprint models. If you ask me which model will work in Spain (for example), I couldn't tell you. The information is out there somewhere, but you need to dig for it.