Orange UK today released a press release announcing it has launched HD Voice on selected mobile handsets giving much greater call quality while in 3G coverage areas.

London, 1st September, 2010: Orange today announced the first major advancement in UK mobile voice calling for 20 years with the launch of mobile High Definition (HD) Voice. Providing crystal clear sound quality for calls, mobile users will see the service set a new consumer benchmark, with today’s move testament to Orange’s continuing focus on innovation.
– HD Voice reduces background noise and decreases perceived distance between callers by providing crystal clear calls
– HD Voice is available from today nationwide at no extra cost for all Orange customers with an HD voice enabled handset

Currently Orange users can only pickup the Nokia 5230, Nokia X6, Nokia E5 and Samsung Omnia Pro as HD Voice enabled phones, however Orange expect further manufactures to offer HD handsets in the coming months.

Source: Orange Press Release

12.19pm Update – Orange have also posted an animated YouTube video giving call samples