If you are looking to download a WhatsApp IPA for iOS 4.2.1 to use on an iPhone 3G or original iPad today, the short verdict is:
: Legacy IPAs are often hosted on the Internet Archive (Archive.org) or specialized communities like r/LegacyJailbreak . Ios 4.2.1 Whatsapp Ipa Download
Have you successfully run WhatsApp on iOS 4.2.1 recently? Share your story in the comments (but be prepared to provide proof). For daily drivers, upgrade to at least an iPhone 5s with iOS 12 for secure, modern WhatsApp access. If you are looking to download a WhatsApp IPA for iOS 4