A mobile radio system comprises first through N-th radio base stations, where N represents a positive integer which is greater than one. The building material of the present invention is prepared from an aqueous mixture of predominately expanded perlite, a small amount of a binder component consisting essentially of calcined gypsum and an organic binder, and optionally a fibrous reinforcement. Application software resident in the caller’s CPE uses the URL to retrieve the home page of the called party from the Internet.