AT&T plans to extend its fastest fiber-optic Internet service to 21 major cities, further ramping up competition with Google and cable providers.

The largest U.S. phone company said in a statement Monday that it plans to expand its GigaPower fiber-optic service to as many as 100 cities and municipalities. To provide service in select communities, AT&T will have to get approval from local officials. AT&T’s proposal is to deliver Internet speeds of as fast as 1 gigabit a second, about 100 times faster than standard web access, along with U-verse television and other services to residents and businesses.