As high-speed LTE services roll out across the US, many are wondering when their neighborhood will benefit. The iPhone app Coverage (US$2.99) produces zoomable maps that detail 2G, 3G, 4G and LTE coverage across all four major US cellular providers: AT&T, Verizon, Sprint and, for those willing to unlock their iPhones, T-Mobile.
The maps are stored locally, so a data connection isn't necessary. I used it to explore my Arizona neighborhood, the East Coast and West Coast. My first impression is that broad LTE coverage is still restricted to the biggest cities, and Verizon is clearly way out in front. AT&T is significantly behind (though working on it), and Sprint and T-Mobile are barely players. That's likely to change as time goes on, and the app will keep the maps updated.