T-Mobile, one of the three largest mobile carriers in the U.S., said it's working to fix a widespread network issue.
The company's president of technology, Neville Ray, country's largest carriers, along with AT&T and Verizon, after buying rival Sprint. The company has started integrating the two networks.
The Federal Communications Commission, which oversees voice and data networks, said its public-safety bureau is looking into the problem.
T-Mobile paid a $17.5 million fine for two nationwide service outages on the same day in August 2014, which together lasted three hours and prevented customers from being able to call 911.
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