It was arranged through my work. You should be able to simply buy a data/minutes plan from your carrier that covers anything you will need. My AT&T iPhone 4s "just worked" for voice and data. As I passed from one country to another I would get a warning message about data rates, but I knew my company had it covered. My brother bought a data package for a hundred bucks or so. Sorry i can't be more helpful. The key is to buy the package before you leave. My brother used his iPhone as a hotspot and we tethered our iPads to it when needed.