A new agreement between LG-Ericsson and LG U+ will see the Ericsson subsidiary provide voice over LTE (VoLTE) services to the South Korean operator.
Demand for LTE data services in South Korea has grown at a rapid rate since LG U+ launched LTE commercially in the country in July last year.
Through the deal with Ericsson's majority-owned subsidiary, users will get access to VoLTE (GSMA IR.92), which could offer enhanced services such as HD voice and video calling.
LG U+ said it is now the second largest LTE provider in South Korea, serving 3.1 million subscribers.
Joo sik Choi, senior vice-president of service creation at LG U+, said: "Improving the user experience for our subscribers is always our top priority.
"Ericsson's global leadership in LTE technology and experience in building an end-to-end LTE network infrastructure helped ensure the success of the nationwide launch of this service."
Johan Wibergh, head of business unit networks at Ericsson, added: "With the new VoLTE technology, LG U+ will be able to offer its subscribers better voice quality and an improved user experience."