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.
No modification of the IPA can restore server connectivity. Ios 4.2.1 Whatsapp Ipa Download
If you must use an iPhone on iOS 4.2.1 for messaging, consider: Never enter your real phone number into a
: A decrypted version of one of the final support branches for legacy systems (requires iOS 4.3 minimum). Community Workarounds Legacy Jailbreak Ios 4.2.1 Whatsapp Ipa Download
Some users have uploaded "Legacy App" collections containing older WhatsApp IPAs (versions 2.8.x). 3. How to Sideload an IPA on iOS 4.2.1