Whats-App not support in Windows, IOS and Android smartphone older version starting in next Year 2020

One of the most popular messaging app "Whats-App" will soon end support for millions of their user starting for the next year. Company has announced its withdraw of support for some smartphones running on Windows, Android and IOS mobile OS.

WhatsApp had already announced that the messaging app would stop providing support for all  Windows phones following Dec 31, 2019. Some Android and iOS devices, too, would not get WhatsApp support starting February 1, 2020.
Whats-App message to their recommended users who are using Android devices running on version 2.3.3 and older to upgrade to the latest version. 
Whats-App for iPhone requires IOS 9 or later. The Facebook-owned app has announced that i-Phones operating on IOS 8 or older will be able to use the service until February 1, 2020. These users can no longer create a new account or reverify their existing account.
1st Feature: 
The same has now been updated on Whats-App blog post and             FAQ pagesBecause we will no longer actively develop for these        platforms, some features may stop functioning at any time.



2nd Feature: WhatsApp has been working on new features to make its app                    experience better for end-users. 
The company recently rolled out the Call waiting feature on Android which would notify a user about an incoming call while they are on another call.


3rd Feature :  One of the most-anticipated WhatsApp features that is a Dark                           mode, which has been in the development stage and                                       is expected to roll out soon

A recent WhatsApp beta update revealed three new hidden options for activating dark mode, namely Light, Dark, and Set by Battery Saver. The third option is said to be available only for smartphones running on Android 9.0 or older.