The new app makes it easy to record and send voice messages with just couple of taps on the keypad.
To get started, JioPhone users only need to verify their phone number and then they can begin chatting with other WhatsApp users, one-on-one or in groups.
"We will be providing WhatsApp, the most used chat application in the world, on all JioPhones starting today (Monday). Jio wants to thank the Facebook and WhatsApp team for making this happen," said Akash Ambani, Director, Reliance Jio Infocomm Ltd.
WhatsApp is available in the JioPhone AppStore starting September 10 and will be rolled out on all JioPhones by September 20, the company said.
People can download WhatsApp on both JioPhone and JioPhone 2 by visiting the AppStore.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)