Viber brings push-to-talk features to iPhone and Android in version 4.0

The past few weeks have been very busy for the Viber team, after first announcing new features for BlackBerry and following it up with a Windows Phone 8 update. Now the VoIP app is announcing version 4.0 for iPhone and Android, bringing with it the addition of push-to-talk voice services to both platforms, as well as optimization for tablets that are running Google's OS. Viber also bundled in a new sticker market (if that's your sort of thing), along with some extra customization options on iPhone and improvement notifications on Android. All in all, it's a pretty nice update, so go on and grab the fresh version from either the App Store or Google Play.