Popular voice and text chat app Viber has expanded to BlackBerry and Windows Phone. The app offers free HD voice calling and text messaging over 3G, 4G, or Wi-Fi in its iOS and Android incarnations and has gained over 69 million users to date. However, neither Windows Phone nor BlackBerry users will be able to make voice calls with the current beta versions of the app, which are restricted to text and photo messaging right now. Viber promises that full releases will come when they "meet Viber's quality standards." We certainly hope so — without voice chat it seems unlikely the app will topple BBM on BlackBerry, and Skype could use a competitor on Windows Phone following its underwhelming launch. You can get the Viber beta from BlackBerry App World or the Windows Phone Marketplace now.