WhatsApp will stop all work on the iPhone phones "3 GSM", and the phones that run iOS 6 operating system.
Application on Android 2.1 or 2.2 phones will not work, and will affect the phones, which were issued between 2010 and 2011 have not been updated.
No one who still uses «Windows Phone 7» would be able to use WhatsApp.
Blackberry and Nokia
The application will work on these phones until June 2017: Blackberry Os, BlackBerry 10, Nokia S40 and Nokia Symbian S60.