With over a billion users, WhatsApp is one of the biggest messaging apps in the world, letting you send texts, photos, video, contact, locations, all for FREE!
You can even make voice calls to any number in the world, for FREE. Did I mention that it's all free? You don't need a pricy calling or data plan to connect with friends and family all over the world – you just need an internet connection!
WhatsApp also lets you back up all of your messages, photos, and video, so that you can take them with you every time you switch phones so that you never lose touch with your contacts.
WhatsApp is free to download and use.