WhatsApp Messenger is the world's most popular instant messaging app for smartphones.
You can use it to send and receive text and voice messages, photos, videos, even call your friends in other countries, and because it uses your phone's internet connection it might not cost you anything at all (depending on whether you'll pay data charges).
It's easy to set up and use. There's no need to create and remember new account names or pins because it works with your phone number, and uses your regular address book to find and connect you with friends who use WhatsApp already.
You can talk one-to-one or in group chats, and because you're always logged in there's no way to miss messages. Even if your phone is turned off, WhatsApp will save your messages and display them as soon as you're back online.
There's plenty more (location sharing, contact exchange, message broadcasting) and the app is free for a year, currently $0.99/ year afterwards.
What's New in Version 2.17.61
- Search messages within a specific chat: Open any chat, tap the chat name at the top to go to Contact Info/Group Info, and then tap Chat Search.
- Design improvements for iOS 11.
- Post text-only updates to your status and they'll be visible for 24 hours. Just tap the pencil icon in the Status tab, type what you'd like to share, and pick a background color or font.