3 WhatsApp
With over 1.5 billion active monthly users and more than 300 million users active each day, WhatsApp is quite literally a big deal. In fact, users send more than 60 billion messages each day. (Those numbers alone are probably what enticed Facebook to purchase it for $19 billion.)
But WhatsApp is more than just a text-based messaging platform. It supports status updates, stickers, and—you guessed it—group video calling. Users looking for a popular, well-made app will enjoy WhatsApp.