MetroPCS (PCS) is en route to becoming the first U.S. carrier to utilize Voice Over LTE (VoLTE). CEO Roger Linquist on Thursday revealed at the Goldman Sachs Communacopia Conference that his company plans to launch VoLTE in all of its LTE markets within the next four to six months, Fierce Wireless reported. MetroPCS launched the service in Dallas earlier this year, and while customers have reported improved voice quality, the company continues to face various technical challenges. “There are a number of changes that need to be made in base station optimization in Dallas,” Linquist said. “This is not your grandfather’s Buick. This is a different animal.” The executive also revealed that the carrier now has more than 1 million LTE subscribers and the churn rate among them was around 1% lower than the company’s overall average, which was 3.4% in the second quarter.