AT&T publishes a mobile coverage map on its website, att.com. Customers can view coverage maps for voice, data, GoPhone service and HD voice. The website also includes an international coverage map for roaming customers as of March 2015.
The AT&T mobile coverage map defaults to domestic voice coverage. Users can use the + and - buttons to zoom in or out on the map of the United States. Selecting the radio buttons next to the options for voice, data and GoPhone service changes the coverage map. To view the international coverage maps, customers can click on the radio buttons under the International category.