I have some problems with the Android version 5.0. Neither Skype nor Viber works with it. I couldn't make calls since my operating system have done the update. Can anyone help me?
Both applications require Android 2.3 and higher to work properly. For the Lollipop support it's described that Lollipop undergoes stability improvements. Expect updates for both applications in near future. There isn't anything you can do now.