: Name the shortcut "WhatsApp" and tap Add . This creates an icon on your home screen that opens the web interface.
You can try using basic web-based lite-messaging sites, though most modern web apps will fail to load in the old Safari browser. Ios 4.2.1 Whatsapp Ipa Download
If you must keep using an iPhone 3GS or similar on iOS 4.2.1, here are realistic options: : Name the shortcut "WhatsApp" and tap Add