Originally Posted by CarlosTheGaucho

Well they got a huge audience by offering something that's functional (although already existed before), spread the news and the brand out there, and then they offer you to purchase add ons that only cost a couple bucks, like having your own number, voice box, credit to call land lines etc.. - good plan and good execution.

I wonder what is the profit and how much did they have to invest into development etc. before turning profit.

Nothing's free.