Once you have obtained an IPA file for WhatsApp 2.3.6, you will need to sideload it onto your iPhone. Sideloading refers to installing an app without going through the official App Store. Several tools can accomplish this:
This comprehensive guide covers the technical history of WhatsApp 2.3.6, why modern users look for it, the critical security risks involved, and how to navigate legacy iOS app installations. The Technical History of WhatsApp 2.3.6 Release Timeline whatsapp 2.3.6 old version download ios
Downloading WhatsApp Version 2.3.6 on iOS: A Complete Guide for Older iPhones Once you have obtained an IPA file for WhatsApp 2