América Móvil offers wireless phone service from the Rio Grande to Tierra del Fuego. The company is Latin America's top mobile carrier with more than 285 million subscribers in 25countries. In Mexico the company enjoys a 70% market share with nearly 74 million subscribers to its Telcel and Telmex brands, which operate retail stores. Its second largest market is Brazil, which serves about 69 million subscribers through Claro. América Móvil also provides fixed-line service in Central America and the Caribbean, with more than 6 million lines. TracFone Wireless is América Móvil's US presence. Billionaire Carlos Slim Helú owns most of América Móvil.