KakaoTalk: Free Calls & Texts
very popular albeit mostly for people not in North America. Much like the others on this list, you can text and call people for free. KakaoTalk also includes group calls which can be a good option for those who frequently require calling multiple people at once. Another good feature of KakaoTalk is multi-platform support. So if you have friends with iOS devices, Blackberry devices, or Windows Phone, you can still make free calls as long as you both use KakaoTalk.