T-Mobile USA, Inc. announced multi-year agreements with Ericsson and Nokia Siemens Networks (NSN) to support T-Mobile?s $4 billion 4G network evolution plan, including network modernization and deployment of long term evolution (LTE) service in 2013.

As part of the agreements, Ericsson and Nokia Siemens Networks will provide and install Release 10 capable equipment at 37,000 cell sites across T-Mobile's 4G network, beginning in 2012. T-Mobile also expects to be the first carrier in North America to broadly deploy antenna integrated radios, enabling accelerated deployment and reduced site loading.

Last week, T-Mobile secured the AWS spectrum licenses from AT&T which were agreed to as part of the breakup of the proposed merger between the two companies. This new spectrum, in addition to the refarming effort, enables the launch of LTE in AWS spectrum and up to 20 MHz of LTE in 75% of the top 25 markets.

As part of the company's network modernization effort, T-Mobile also plans to launch 4G HSPA+ service in the 1900 MHz band in a large number of markets by the end of the year. The company's network modernization trials have shown up to a 33 percent increase in HSPA+ data speeds as well as improved in-building coverage. Rolling out 4G HSPA+ services in the 1900 MHz band will also provide T-Mobile's customers with the ability to use a broader range of devices, including the iPhone, on T-Mobile's 4G network.

T-Mobile is commissioning a "4G LTE" network, the same technology used by Verizon Wireless and AT&T Inc. for their high-speed networks.