WhatsApp Messenger is a FREE messaging app available for Android and other smartphones. WhatsApp uses your phone's Internet connection (4G / 3G / 2G / EDGE or Wi-Fi, depending on availability) to allow you to text 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. WhatsApp calls use your phone's internet connection instead of your cellular plan's voice minutes. (Note: Data charges may apply. Contact your provider for details. You also cannot access emergency and emergency numbers via WhatsApp).
Supported Android Devices : [4.0.3–4.0.4] Ice Cream Sandwich - [4.1–4.3.1] Jelly Bean - [4.4–4.4.4] KitKat - [5.0–5.0.2] Lollipop - [6.0 - 6.0.1] Marshmallow - [7.0 – 7.1.1] Nougat - [8.0-8.1] Oreo -  Pie