Orange has announced it will offer UK mobile customers a High Definition Voice service this year.
The mobile network said HD Voice "delivers excellent audio quality to mobile calls" and will be available to those with compatible handsets.
The technology uses the speech bandwidth of 50-7000Hz compared to the current narrowband speech codec of 300-3400 Hz.
Orange is already working with handset manufacturers and devices supporting HD Voice, which will be rolled out throughout 2010.
Tom Alexander, CEO of Orange UK, said: "Orange is proud to be leading the industry into the next decade by announcing a new standard in voice innovation that will transform the mobile experience for customers in the UK."
"HD Voice really does inject a level of innovation into mobile phone calls, making it sound as if callers are actually in the same room. Once people have tried it, they won't want to go back."