LG Electronics on Wednesday unveiled a smartphone that offers voice call service through the fourth- generation (4G) long-term evolution (LTE) networks. LG's Optimus LTE2 smartphone that supports the voice over LTE (VoLTE) service was rolled out in Seoul through wireless carrier LG Uplus.

The company also launched the VoLTE-supporting Connect 4G smartphone in the United States via the U.S. mobile operator Metro PCS.

The two smartphones added the VoLTE function to the Optimus LTE2 and Connect 4G models that were released in May in South Korea and in March in the U.S. respectively. LG said that it planned to provide software upgrades for Optimus LTE2 users who want to use the service.



The VoLTE service offers voice and video call service through the 4G LTE networks, enabling users to enjoy clearer quality and faster connection than the third-generation (3G) networks, the company said.

S. Korean SK Telecom will also offer VoLTE function to the Samsung Galaxy S3 models with a software upgrade schedulled for release later this month in South Korea.