Philadelphia Area Coverage Map (see below for national coverage map) Coverage shown on the coverage maps is a general prediction of outdoor coverage, and does not guarantee that coverage will be available at all covered geographic areas at all times. Wireless coverage is impacted by, among other things, terrain, weather, antenna location, system modification, foliage and man-made structures (such as buildings), and therefore cannot be predicted precisely at all times.   Digital cellular coverage and Direct Connect coverage (approximate)   Digital cellular coverage and Nationwide Direct Connect coverage (approximate)