Orange is to trial high-definition voice calls on its network in the south of England in a bid to offer improved call quality.
The trial will take place in Bristol, Reading and Southampton for a select number of consumers and small businesses.
Orange claimed that the system eliminates the distortion of long-distance calls, which will sound as if they being made from the next room.
Tom Alexander, chief executive of Everything Everywhere, the parent company of the recently merged Orange and T-Mobile, argued that the trial is a "significant milestone" in the company's goal of delivering the best service in the industry.
"High-definition voice represents a huge advance for the customer experience, and a great leap forward for the mobile industry. We are delighted to be at the forefront in bringing this innovation to the UK public," he said.
A nationwide roll-out of the service will take place before the end of the summer, Orange said.
The technology works by using a wider speech bandwidth of 50Hz to 7,000Hz, compared to the current 300Hz to 3,400Hz.
The system then uses the Wideband Adaptive Multi-Rate speech codec to deliver enhanced sound quality on the same network resources.
Orange announced the trial in February, and ran a similar trial in Moldova earlier this year.
Geoengineering on the sea floor near glaciers would form a new ice shelf to prevent melting
Alterations in capillary blood flow can be caused by body position change
Curiosity rover is in 'normal mode' but not transmitting scientific data back to base
NatWest outage comes a day after Barclays' IT systems shut out customers and staff