
While Viber has the benefit of being available on multiple devices across different platforms, it's let down by very buggy software. If you switch to a new phone, you'll have to perform the setup fresh each time, and you won't be able to see older conversations.Īll three services offer the same core functionality of sending text and photo messages for free over an Internet connection. If you use more than one phone at once then you'll have to switch to your 'main' phone to use WhatsApp.


That means you can't use it on more than one device, and there's no desktop software you can use either. Unlike Viber, WhatsApp must be linked to your phone with your SIM card and phone number, acting more like the built-in SMS tool than an IM client. WhatsApp lets you send photos, videos, audio, map locations but you can't video call.
