You cannot create new accounts or re-verify existing ones on iOS 7.1.2. 3. Reported Workarounds (Use with Caution)

This is where the file comes in. An IPA (iOS App Store Package) is the archive file for an iOS app. To get WhatsApp running on iOS 7.1.2, you need the specific last compatible IPA.

If you are an enthusiast attempting to use an iPhone 4 for "tech detox" or hobbyist purposes, the Legacy Jailbreak community occasionally develops custom projects. About supported operating systems - WhatsApp Help Center

If you still need the IPA for offline research or jailbreak development, use these verified sources (do not use for daily driving):

Before you search for an IPA file, you must understand the current situation regarding WhatsApp security: