AT&T Mobility (formerly Cingular Wireless), based in Atlanta, began as a joint venture between AT&T (formerly SBC Communications) and BellSouth. Cingular became wholly-owned by the new AT&T in December 2006 as a result of AT&T's acquistion of BellSouth. It is a provider of mobile voice and data communications throughout the United States and Puerto Rico. AT&T launched wireless services using enhanced data rates for GSM evolution (EDGE) technology. The company also provides corporate email and other advanced data services through its GPRS, EDGE and Mobitex packet data networks.

Claro is the mobile subsidiary of the Puerto Rico Telephone Company, which was acquired by Mexican América Móvil in March 2007. Verizon launched the service in San Juan in mid-2004 and following the acquisition América Móvil relaunched service under the brand name Claro. It operates a CDMA2000 EV-DO network throughout the island.

With 16 years of experience, Puerto Rican Intech, offers networking , security and IP solution services. Partners include HP, Microsoft, Cisco and Telefónica.

Formerly New Comm Wireless (Movistar), it was acquired by US-based telecoms holding companies M/C Venture Partners and Columbia Capital in March 2007. It changed its legal name to Open Mobile and was relaunched on 12 June 2007. The company provides wireless communications services throughout the island of Puerto Rico.

Holding company which controls the Puerto Rico Telephone Company. PRTC is the state-owned telecommunications holding company, while ESOP is a group of PRTC employees.

Telefónica Larga Distancia de Puerto Rico (TLD de Puerto Rico), established in Puerto Rico in 1992, is a subsidiary of Spanish multinational group Telefónica. TLD offers an extensive portfolio of telecommunications products and services in Puerto Rico and the U.S. Virgin Islands.