MEXICO CITY--(BUSINESS WIRE)--In a meeting today with Mexico President Enrique Peña Nieto, AT&T1 Chairman and CEO Randall Stephenson announced that AT&T plans to invest approximately US$3 billion to extend its high-speed, mobile Internet service to Mexico, covering 100 million people in Mexico by year-end 2018. This is in addition to the US$4.4 billion AT&T invested earlier this year to acquire Iusacell and NEXTEL Mexico. “We are building a network in Mexico that is capable of bring