Popular Messaging And Voice App Viber Unveils Version 4.2 For iPhone With A Redesigned Look, A Bevy Of Feature Updates, And Long Awaited BlackBerry 10 App Viber, (www.viber.com) the leading mobile communications platform offering free messaging and HD-quality phone calls, announced today the release of its redesigned iPhone app that is designed for iOS 7, bringing multiple enhancements to iPhone users. The company has simultaneously released a new mobile app for BlackBerry 10, bringing Viber to BlackBerry’s latest OS with many of the most popular Viber features for the first time.