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You do have a good point, but I think the new feature that this offers is that you can do calls that would normally be expensive on many VOIP options for a very low fee. Options like Skype, WhatsApp, FaceTime, etc. work very well when on wifi and have a good following accordingly for their ease of use. When off wifi however, they default to using mobile data which is either unavailable (most likely if you are traveling and thus cannot use your regular phone plan) or can be expensive, especially with video calling.

I believe the idea of Ziber is to use other user's phone plans to route the call through, meaning that the connection to their device would be a lot shorter distance and thus not incur as much of a fee. Ex. You are in the US and call someone in France by connecting to a device that has unlimited international calling. I will look into it further, but that is my initial impression.

I get it but I just think a lot of people would seek out WIFI to make the call for free and with less hassle. Also things are changing, on my network we now have "feel at home" which allows us to use all our minutes, texts and data in about 30 different countries at no extra cost and the EU is getting rid of roaming charges. There may be times when Ziber would be useful but I just don't think the mass market would ever need it.