After installation, WhatsApp will ask for your phone number. You will receive an SMS or call. The verification system may fail because the old API endpoints are deprecated. Many users report that verification works only if you have previously used WhatsApp on that number with an older device.
Meta regularly ends support for older operating systems to focus resources on newer features and security protocols. India Today About supported operating systems | WhatsApp Help Center download whatsapp for android version 4.1.1
Have questions about your specific Android 4.1.1 device? Leave a comment below (but check on a modern phone — the old browser might not load the comment form). After installation, WhatsApp will ask for your phone number