T-Mobile (NASDAQ:TMUS) has reported earnings, and continues to make progress with shaking up the domestic wireless industry. The company's aggressive marketing and pricing are definitely paying off in a big way as the #4 U.S. carrier was able to add about 1 million branded subscribers this quarter, bringing the full year customer additions to a total of about 4.4 billion. However, expensive marketing and aggressive pricing are definitely weighing on the bottom line of the company. T-Mobile reported that its net loss did widen slightly this quarter to about $20 million, or $0.03 per share.

In this segment from Tuesday's Tech Teardown, Motley Fool tech and telecom bureau chief Evan Niu talks with host Erin Kennedy about the pros and cons of T-Mobile's customer growth strategy. He also takes a look at how the company's integration of MetroPCS and its spectrum are coming along, and how successfully the cost-saving synergies from that deal are playing out.