It´s simple Viber is worthless if your friends don't have it, therefore free.
Maybe someday they will flip the free on/off switch, and loose the majority of the users. Or they could do something smart with ads maybe, listen to the conversation and put appropriate ads in the app?
One thing they don't have, I think, is P2P as Skype and therefore must have more operating costs.
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[ 3.0 ms ] story [ 13.9 ms ] threadMaybe someday they will flip the free on/off switch, and loose the majority of the users. Or they could do something smart with ads maybe, listen to the conversation and put appropriate ads in the app?
One thing they don't have, I think, is P2P as Skype and therefore must have more operating costs.