Commercial inter-island wireless service began in 1901, and radiotelephone service to the mainland was established in 1931. In 2001, 96.9% of Hawaii's occupied housing units had telephones. Hawaii had 14 major AM radio stations and 21 major FM stations as of 2003, as well as 10 major television stations. A total of 27,025 Internet domain names were registered in Hawaii by the year 2000.