WhatsApp Messenger is a FREE messaging application available for Android and other smartphones. WhatsApp uses your phone's Internet connection (4G / 3G / 2G / EDGE or Wi-Fi, as available) to allow you to send messages and call friends and family. Switch from SMS to WhatsApp to send and receive messages, calls, photos, videos, documents and voice messages. FREE CALLS: Call your friends and family for free with WhatsApp Calling, even if they are in another country. Internet connection from your phone instead of voice minutes from your cell plan. (Note: data charges may apply. Contact your provider for more information. Also, you cannot access 911 or other emergency service numbers through WhatsApp).
Required Android Versions : Ice Cream Sandwich [4.0.3–4.0.4] - Jelly Bean [4.1–4.3.1] - KitKat [4.4–4.4.4] - Lollipop [5.0–5.0.2] - Marshmallow [6.0 - 6.0.1] - Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]