The company added through its blog post that despite it was a tough decision for them to make, but still the right one in order to provide better service and better ways to keep in touch with your family, friends and loved ones using Whatsapp.
Therefore if your phone falls within the stated range, you are advised to either upgrade to the newer version of Andriod, iPhone, Window or get a newer ones before the due date.
Below is what they wrote on their blog:
As we look ahead to our next seven years, we want to focus our efforts on the mobile platforms the vast majority of people use. So, by the end of 2016, we will be ending support for WhatsApp Messenger on the following mobile platforms:
– BlackBerry OS and BlackBerry 10
– Nokia S40
– Nokia Symbian S60
– Android 2.1 and Android 2.2
– Windows Phone 7
– iPhone 3GS/iOS 6
While these mobile devices have been an important part of our story, they don’t offer the kind of capabilities we need to expand our app’s features in the future.
This was a tough decision for us to make, but the right one in order to give people better ways to keep in touch with friends, family, and loved ones using WhatsApp. If you use one of these affected mobile devices, we recommend upgrading to a newer Android, iPhone, or Windows Phone before the end of 2016 to continue using WhatsApp.
UPDATE: WhatsApp is extending support for BlackBerry OS, BlackBerry 10, Nokia S40 and Nokia Symbian S60 until June 30, 2017.