T-Mobile added 325,000 new customers in the second quarter on its way to a $425 million profit.

The wireless operator reported $4.77 billion in service revenues, which was down from $4.85 billion for the same period a year ago. T-Mobile said it was experiencing lower voice revenues, but these were offset by growth in data revenues.

The fourth-largest U.S. carrier continues to see dividends in its 3G network, as mobile data service revenues were up 23% from last year. The 3G-capable T-Mobile G1 continues to be a good seller, and the company just launched another Android-powered handset with the myTouch 3G.

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— Marin Perez, InformationWeek