Viber is consistently working hard to bring you an improved and smoother experience for their app and there are certain features that are iPhone exclusive.
Some of those features are:
• Saving media to camera roll, which can either be done automatically) by enabling that feature) or manually by doing it yourself.
• Using 3D touch. By long tapping on the Viber icon, you can access your most recent Viber activities; by choosing any one of them, Viber will take you directly to that location. You can also quickly open a new chat.
• Quick reply: Drag down on a new message notification and open a reply screen. Type a reply and send a reply. No need to open the app.
• Spotlight Search through which you can search for Viber conversations.