Puerto Rico Telephone (PRT) has the island wired ... and wireless. The company provides nationwide fixed-line and wireless services to residential, government, and consumer customers in Puerto Rico and the Caribbean. PRT has more than 1 million combined landline and mobile subscribers, making it the island nation's largest telecommunications company in terms of customers. Wireless service is sold under the Claro brand. PRT also sells Internet access bundled with computer telephony service under the DMAX brand. The company, which began providing services in Puerto Rico in 1914, also offers long distance services. PRT is a subsidiary of Mexico City-based Am�rica M�vil.