WhatsApp Messenger is a messaging app available for Android and other smartphones. WhatsApp uses your phone’s Internet connection (4G/3G/2G/EDGE or Wi-Fi, as available) to message and call friends and family. Switch from SMS to WhatsApp to send and receive messages, calls, photos, videos, and Voice Messages. First year FREE!* (WhatsApp may charge thereafter, current price is $0.99 USD/year).