North American Coverage MapsCellphone Coverage Maps

As you shop around for a service provider, check to see that the wireless company you’re looking at offers the type of phone service you need in the areas you’re most likely to visit or travel to.

cell Reception This site rates the coverage of every wireless network servicing your zip code. It also provides links to national coverage maps and a map that shows the location of every cell tower in your city. It also has a state by state list of dead spots. All-in-all, a very useful site!
RootMetrics Carrier Coverage Map This site shows the relative strength of voice and data signals for each wireless network in your area. You can look at whole cities or drill down to individual cell sites. It’s great for comparison shopping.
Signal Map This site shows the signal strength at each cell site in your neighborhood. It also shows network dead zones.
GSM World Coverage Map and GSM Country List Here’s a great site to check the compatibility of GSM bands from country to country.