T-Mobile today announced that it will improve phone call quality on select smartphones by launching HD Voice across its 4G network. The new HD Voice system "dramatically improves in-call voice quality," according to T-Mobile, and can reduce surrounding wind and noise around the device's microphone. There are limits to enhanced calling options. Both callers must use T-Mobile 4G smartphones, so calling non-4G phones will not yield any benefits in call quality.

T-Mobile is moving towards being more of a no-contract carrier, or The UNCarrier as the fourth place network in the U.S. likes to say, following the unveiling of new calling plans and the end of smartphone subsidies.

T-Mobile is the last of the four major carriers in the U.S. to launch 4G LTE, but the fourth-place operator plans to hit the ground running with today's announcement of its imminent LTE launch.

T-Mobile and MetroPCS have gained the approval of both the U.S. Department of Justice and the FCC for their proposed merger to form one company. Now only one major step remains.

MetroPCS and T-Mobile are on track to gain government for their proposed merger, but the companies will still need MetroPCS stockholders to approve the deal. In anticipation of an April 12 vote on the matter, MetroPCS has sent a letter urging stockholders to approve the deal.

The proposed reverse merger between T-Mobile USA and MetroPCS won't be opposed by the Department of Justice. The review period for the DOJ to attempt to block the merger has passed, leaving only a few more steps for the deal to be finalized.

T-Mobile parent company Deutsche Telekom today reported its 2012 financial earnings, and the company finally had some good news to report for its U.S. division. Customer numbers increased for the first time since 2009, but that wasn't exactly cause for celebration.

Though Nokia announced last week that it has begun its rollout of the Windows Phone 7.8 update, T-Mobile USA has confirmed that the Nokia Lumia 710 won't be receiving the update.

Android developers discovered last month that some Samsung smartphones using Exynos processors are vulnerable to attacks. Samsung announced shortly after that it would get to work patching the security hole, and three U.S. carriers today began updating their devices.

T-Mobile previously confirmed one of tech's oldest rumors that it will begin selling Apple products in 2013, and CEO John Legere has stated that it will offer the Apple iPhone later this spring.