HIGHLIGHTS
WhatsApp to continue working on BlackBerry and Nokia S40 platforms
But Nokia Symbian S60 support will end this June
Nokia Symbian S60 users will have option to get chat backups in email

WhatsApp has become an essential messaging app amongst all kinds of mobile users irrespective of the operating system their devices run on. In February last year, Facebook-owned WhatsApp announced to end support for BlackBerry OS and Nokia S40 platforms, which got pushed back to June this year. It seems that the end-of-life date has been pushed back yet again, as the company has reportedly confirmed the extension of its services for BlackBerry and Nokia S40 platforms till December 2017 and December 2018 respectively.
Update : WhatsApp has confirmed the revised end-of-life timelines for the BlackBerry OS, BlackBerry 10, and Nokia S40 platforms on its website.
The WhatsApp apps for BlackBerry 10 and BlackBerry OS7+ received an update on Monday that extends support for the platforms until December 31, 2017. According to the website, the changelog of the update, seen on devices, states "changed client end-of-life date to December 31, 2017". This means that WhatsApp users on eligible BlackBerry devices will be continue sending and receiving messages, calls till the end of the year.