Even if you successfully download an “iOS 4.2.1 WhatsApp IPA,” you face three insurmountable walls:
Since the native app will not work, you can create a shortcut to WhatsApp Web on your home screen to simulate the app experience. : Navigate to the WhatsApp Web site. Ios 4.2.1 Whatsapp Ipa Download
Never enter your real phone number into a sideloaded, cracked, or suspicious WhatsApp IPA. Use a Google Voice number or a prepaid burner if you choose to test. Even if you successfully download an “iOS 4