Even if you install an old APK, WhatsApp’s servers often check the version number and prevent you from logging in.
If WhatsApp refuses to connect due to server-side restrictions, your hardware might still be useful with these lighter messaging apps that often support older Android builds longer than WhatsApp does: Download Whatsapp Old Version For Android 2-3-6
WhatsApp blocked new account creations and phone number reverifications for Android 2.3.7 and older. Even if you install an old APK, WhatsApp’s
On your computer, visit APKMirror and search for "WhatsApp Messenger 2.18.305" . Ensure the variant matches (most Gingerbread phones use this architecture). The file name should look like: Download Whatsapp Old Version For Android 2-3-6