According to WhatsApp’s FAQ page, smartphones that work on Android 4.0.3 or newer operating system will only get WhatsApp support from January 1, 2020. That is, if your phone runs on an operating system older than Android 4.0.3, then from next year you will not get the benefit of this instant messaging app WhatsApp owned by Facbook. Giving information about iOS device, not only Android, the company said that from next year, only WhatsApp app will be supported on iOS 9 and above. Apart from this, only on KaiOS 2.5.1 and newer versions, you will be able to take advantage of WhatsApp.
If you use a phone that works on the older version than the above version and which is not eligible for these updates in future, then you will not be able to avail the WhatsApp service from January 1.
According to the report by Mysmartprice, WhatsApp will not release updates for iPhone 4 and older phones. These models do not support iOS 9. Apart from this, Android phones that work on older operating systems include smartphones such as Samsung Galaxy S2, Samsung Galaxy Note 3, Sony Xperia Z1, HTC One M7, Moto X and Xiaomi Mi 3.