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.
( 4.0.3 and up)
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 - 5.1.1),Marshmallow (6.0 - 6.0.1),Nougat (7.0 – 7.1.1),Oreo (8.0-8.1), Pie(9.0)