The company's service will be available in only "select areas" in certain states across the central part of the US initially.
That's the word from Sprint CEO Dan Hesse, who says that the feature should be available "around the first of July."
Company's head of mobility, Ralph de la Vega, makes the announcement at AT&T's developer conference.
Every Sprint smartphone will be able to pick up the three different spectrum frequencies the carrier runs. The exception, of course, is the iPhone, which Sprint declined to comment on.
CommuniGate System uses Global IP Solutions' VoiceEngine to power its Pronto IP voice communication.
Carrier to deploy the improved voice calling feature when it begins routing voice calls over its LTE network, AllThingsD reports.
Supertooth launched the HD Voice Bluetooth speaker phone for cars at CES 2013, noting that it has two speakers and two microphones for superior call quality.
Big Red won't roll out the higher-quality voice service until 2014 as the U.S. carriers continue to run into hiccups.
The company is accelerating its LTE deployment with a target of covering 100 million people by the middle of the year.
Telstra has confirmed that it will support high-definition voice calls on its HD Voice service as a feature of the iPhone 5, making it one of only 20 telcos to do so worldwide.