eng questions

You've heard that making phone calls over the Internet is cheap and easy. Now, for those of you who haven't tried it, no more excuses: Try Jajah. This is one of the smoothest, simplest, and cheapest ways to make Internet calls. Unlike Skype, it doesn't require downloaded software. You don't even need a broadband connection.
According to paragraph one, why is Jajah a good tool to make Internet phone calls?