WhatsApp No Longer Supports Devices Running iOS 9, Requires iPhone 5 or Later
WhatsApp Ends Support for iOS 9, iPhone 4s Also Dropped Out of the Picture
WhatsApp now requires you to run iOS 10 which was released back in 2016. Now, you should at least have an iPhone 5 to run WhatsApp runs iOS 10. If you have an iPhone 5 or a later model, you should not be bothered by the latest update. What this means is that the iPhone 4s that run iOS 9 is not compatible with WhatsApp anymore.
Last year, the Facebook-owned messaging service dropped support for iOS 8 and older versions of the operating system. This is a year-over-year ending of support for the operating system. If we are going by the trend, we will potentially see the company end support for iOS 10 next year. However, nothing can be said for sure at this point in time and the final word rests with the company. Right now, WhatsApp has ended support for all iPhone models running iOS 9.
WhatsApp Messenger for iOS 2.21.50 is available now on the App Store.
• It drops the iOS 9 support.
• The new archive is not available yet. https://t.co/cFKMpctZRH
— WABetaInfo (@WABetaInfo) March 15, 2021
Since you are never sure what the update might bring on older devices, it is always best to create a backup of your WhatsApp chat just to be on the safe side. You can set the backup option on your iPhone in the app's settings. Once you create a backup of the chats to iCloud, you can restore it on a new device that runs a compatible build with WhatsApp, any version after iOS 9.