You can install the on iOS 6 for aesthetic or archival purposes, but you cannot send or receive messages . For a functional legacy experience, many users turn to Telegram (via old web versions) or iMessage , which still maintains some limited compatibility on older firmware. About supported operating systems | WhatsApp Help Center
Not officially, and even with workarounds, it is largely non-functional. whatsapp ipa ios 6
While you may find archived .ipa files on sites like the Internet Archive or legacy forums, they will not allow you to chat. You can install the on iOS 6 for