At the end of 2019, WhatsApp suddenly dropped a shock bomb. WhatsApp announced that it will stop supporting some older Android and iPhone phones from February 1, 2020. Millions of mobile phones worldwide are currently expected to be affected.
WhatsApp will stop supporting the following older phones:
 Android phone with Android 2.3.7 or older
 iPhone with iOS 8 or older.
Android phone users need to use 4.0.3 or newer mobile operating system in order not to be affected.
And Apple mobile phone users need to pay attention to: iPhone 4S or later new iPhone can be upgraded to iOS 9 or later. iPhone 4 or older iPhones will not be able to use the new version of iOS, and will not be able to use WhatsApp. This means that these mobile phone users must change their phones to use WhatsApp.
In addition, starting December 31 this year, WhatsApp will stop supporting all Window Phones. Old phone users using Windows Phone must back up their call logs on December 31 and upgrade to a higher system before they can continue using WhatsApp.