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Viber is a popular messaging application that includes all the features that Whatsapp provides. The app offers end-to-end encryption in calls, messages and the shared media. Moreover, the messages saved in multiple devices are also encrypted, which brings us to the fact that the messaging apps packs in multi-device support, which WhatsApp lacks. Like WhatsApp, Viber lets you make video and voice calls but the app goes one step ahead with its Viber Out feature, which lets you make international calls to non-Viber users at nominal rates.