I'm a weirdo who's never had a smartphone and will be getting one soon so I've been reading about apps that I should be using and I read about Viber. It was presented as "a mobile messenger app that allows users to make phone calls and send text messages for free." Now, my question is, what's the catch. How do cell phone companies stay in business if this thing can do that? I assume it does it over the internet, so I'd figure people would just need internet access on their phones if this thing can do that.