Silicon Valley:-
WhatsApp is to end support for a number of operating systems including Blackberry 10, Nokia Symbian S60 and Windows Phone 7.1. The company said it wanted to focus development ‘on the mobile platforms the vast majority of people use’. Facebook-owned WhatsApp, which is used by a billion people worldwide, will stop working on the named operating systems by December 2016. But it will still work on Blackberry’s latest smartphone which runs Android.–BBC

Most of the operating systems that WhatsApp is dropping support for are legacy operating systems, which are no longer updated or installed on new devices.