Older versions do not support modern end-to-end encryption protocols, making your private conversations vulnerable to interception. Are There Any Alternatives?
If you decide to download WhatsApp on Android 2.3.6, make sure to: android 2.3 6 whatsapp download
As of February 1, 2020, WhatsApp officially ended support for all Android versions older than 4.0.3 (Ice Cream Sandwich). This means: Older versions do not support modern end-to-end encryption