I love whats app . its a best way to connect to all . WhatsApp has become the most popular instant messaging app, connecting more than a billion people worldwide. These people, who most probably include you and me, can share instant messages and multimedia files for free, and more interestingly, can talk for free unlimited. The app works on nearly all smartphone models and is also available for computers, and works on Wi-Fi, 3G, and 4G networks.its a good app for video calling also and the quality of video is too good and thier are also no signal problems in video calling also. best app ever