Voice over LTE Gains Momentum, From Low Base

"The US and Asia, especially South Korea, are leading the voice over LTE charge, with Verizon Wireless, Metro PCS, SK Telecom and LG U all planning to launch VoLTE services this year,” says  Stéphane Téral,  Infonetics Research principal analyst for mobile infrastructure and carrier economics.

"South Korea and Hong Kong have already successfully launched LTE data roaming and by August, SK Telecom expects to have the Samsung Galaxy S3, the first handset to support VoLTE on their network," he says.

Keep in mind that the growth is from a small end user base. By 2016 VoLTE will make up only about 14 percent of global mobile VoIP revenue, while over-the-top mobile VoIP continues to make up the lion's share by far,” he says.