: Open the shortcut and scan the QR code using your primary smartphone (where WhatsApp is already active) by going to Settings > Linked Devices . Limitations for iOS 4.2.1
or newer. Devices running iOS 4.2.1, such as the iPhone 3G, have been unable to connect to WhatsApp servers since approximately Apple Support Community Key Issues with Legacy Versions Activation Lockout Ios 4.2.1 Whatsapp Ipa Download
Even if the app opens, it will immediately prompt you for a "critical update." Since your OS cannot run the newer version, the app will refuse to connect to WhatsApp's servers. : Open the shortcut and scan the QR
Since the app itself rarely works on such old firmware, consider these alternatives: About supported operating systems | WhatsApp Help Center Since the app itself rarely works on such
While the native Safari on iOS 4.2.1 is too old for WhatsApp Web , you may have limited success with lighter, text-based web services or specialized legacy browsers like Opera Mini (if still available for that firmware).