Some of the affected phones include iPhones and Android smartphones.
According to the company, the move is to withdraw its support for older versions of Operating System (OS) from next year, noting that several Android and iOS phones may no longer be able to run the app going forward.
It listed affected mobile phones like iPhone 4S, the iPhone 5, the iPhone 5S, the iPhone 6, and the iPhone 6S.
It, however, explained that the instant messaging platform will keep the app running for select phones with KaiOS 2.5.1 OS or newer, including JioPhone and JioPhone 2.
To check which OS in the iPhone category is running, go to the Settings menu, then to the General and Information option, Software and the users will be able to see the OS running that particular iPhone.
Meanwhile below are some of the phones that would lose WhatsApp support from January 1, 2021: Apple iPhone 1-4; Samsung Galaxy S2; HTC Desire; LG Optimus Black; Motorola Droid Razr; Any Android released before 2010.
These phones will need to update to at least iOS 9 or Android OS 4.0.3: Apple iPhone 4S; iPhone 5; iPhone 5S; iPhone 6; iPhone 6S; Samsung Galaxy S3; Samsung Galaxy Note; HTC Sensation; HTC Thunderbolt; LG Lucid; Motorola Droid 4 and other newer devices. Other phones that need to be updated include Samsung Galaxy S2; HTC Desire; Motorola Droid Razr; LG Optimus Black and any Android released before 2010.