The 2 carriers with the largest coverage are AT&T (gsm network) and Verizon (cdma network). I would try one of those 2 companies out and you will have coverage in your house. I would use AT&T if you plan on using your phone out of the country, like if you plan on going back to your homeland or going on a cruise. Verizon, Sprint and Alltel will not work outside of north America because they are on the cdma network.

Let me know who your carrier is and I can help you out more.