Viber has updated its Windows Phone 7.5 app too with HD calling support. You can download the updated Viber app for Windows Phone 7.5 from Windows Phone Store for free.
The redesigned Viber app for Windows Phone 7.5 offers free calls with HD sound. Connect in group conversations with up to 40 people. The app, which syncs directly with your address book, also makes it easy to share photos and your location.
|Viber for Windows Phone 7.5 too updated with HD calling support|