Carlos Slim, America Movil's (AMX) largest shareholder, became the world's richest man in part from his investments in wireless phone service. His empire spans 18 countries and has 200 million subscribers.Let's look at America Movil's spectacular growth. The company's markets are primarily in Latin America. American Movil controls 74% of wireless service in Mexico under its Telcel brand, which has 60 million subscribers. Brazil is second with 45 million subscribers. It also is the largest provider in the Caribbean with four million users.
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