Today ThreeUK announced that they will be rolling out High Definition voice calls across their network. The difference in the quality of the calls are supposed to be very impressive, plus it's free on the network.
Basically it works by opening up the phone’s audio range, allowing it to capture and transmit sounds across a wider band of frequencies.
For the full details on the announcement then head over to the ThreeUK blog for all the details.
I have not experienced this myself, however Abul from Adonismobile has had a go of this last year, I recommend clicking here to read his thoughts.
As always I am always interested in your thoughts so if you have any comments or feedback then please feel free to add any comments, or you can mail me here.