This may not be the answer you're looking for. But Viber is what Skype would have been if it hadn't been bought out by Microsoft and turned into a steaming pile of shit that would make CurrentlySober envious.
Viber is so good, in fact, that its inevitable that someday, some big corporation is going to buy it out and turn it into another steaming pile of shit like Skype. I hope I'm wrong, but just saying.
https://www.viber.com/