AT&T continues to expand its 5G network, as the carrier has just that its blazing-fast data service is now available in 100 markets. Today, 20 new cities have been added to the list of markets with AT&T 5G network coverage.These cities should benefit from 5G mobile service starting this week, as long as those trying to access the 5G network are using a compatible device: Allentown, Pa., Brown County, Ind., Hancock County, Ga., Hancock County, Ohio, Harrisburg, Pa., Huntsville, Ala., Kent County, Del., Lexington-Fayette, Ky., Otsego County, N.Y., Reading, Pa., Reno, Nev., Sandusky ...