An iPhone app, called Coverage, on the App Store will show users in the U.S. the difference in coverage from a variety of carriers.

[ad#Google Adsense 300×250 in story]Given tomorrows expected Verizon iPhone announcement, it’s particularly interesting to see the coverage between AT&T and Verizon. Even though the iPhone is not officially available on T-Mobile and Sprint, the app maps their coverage locations as well.

The app shows coverage maps for mainland U.S., as well as Alaska, Hawaii, Puerto Rico, and the US Virgin Islands.

The app is available from the App Store and costs $1.99.