However, there is a workaround if you have previously downloaded WhatsApp on that Apple ID before.
The App Store will install the last version of WhatsApp that was compatible with iOS 9 (likely version 2.21.x). whatsapp ios 9.3 6 download
You can only use this method if you have downloaded WhatsApp in the past on the Apple ID you are using. If you have never downloaded WhatsApp with that account, you cannot install it. However, there is a workaround if you have
You can use the iPhone 6 as a dedicated "screen" for WhatsApp Web. such as the iPhone 4s
Devices limited to iOS 9.3.6, such as the iPhone 4s , can no longer run the app.