T-Mobile has released its 2010 Second Quarter financial numbers and while revenues increased slightly, the customer base continued its decline.

Total revenues are being reported at $5.36 billion in the second quarter of 2010, up $5.34 billion from 2009's second quarter.

For the second quarter of 2010, total customers declined by 93,000. T-Mobile saw a net customer additions of 325,000 in the second quarter of 2009. The company reported a decline of 77,000 customers during the first quarter of 2010. In the end, T-Mobile is serving 33.6 million customers at the close of the 2010 second quarter.

As we saw with AT&T and Verizon's quarterly reports, T-Mobile experienced an 18% increase in data service revenues. During the 2010 second quarter the company earned $1.17 billion on data. Of the 33.6 million customers, 6.5 million were using 3G capable smartphones, an increase of 25% from the 2010 first quarter and dramatically up from the 2.1 million reported in the second quarter 2009.

“In the second quarter of 2010, customers embraced T-Mobile USA’s industry leading value which makes it simple and affordable for consumers to trade-up to next generation products and services,” said Robert Dotson, President and CEO, T-Mobile, USA. “The number of 3G smartphones in the hands of our customers year-over-year has tripled to 6.5 million supported by a network that offers the broadest reach of 4G speeds in the U.S. as our growth continues through data revenues.”