The service for BlackBerry and Nokia operating systems will end by June this year.
Instant messaging app WhatsApp has pulled support for older versions of iOS and Android operating systems, blocking the chat app for millions.
The platforms no longer supported by the Facebook-owned company include Android 2.1 and Android 2.2, Windows Phone 7 and iPhone 3GS/iOS 6.
The move is part of the company s plans to make the service available on new operating systems in order to introduce enhanced features and security.
Whatsapp said in a blog: Earlier this week WhatsApp turned seven years old.
It has been an amazing journey and in the coming months we re putting an even greater emphasis on security features and more ways to stay in touch with the people that you care about.