To get started chatting via WhatsApp on the desktop, head into your app on Android, Windows Phone, or BlackBerry. You’ll see a “WhatsApp Web” screen, which is where you scan the QR code on WhatsApp’s web portal.
The scan links the browser experience with your app. WhatsApp also says your phone needs to stay connected to the Internet for it to work, which means turning your phone off or slipping it into Airplane Mode could disable your browser session.
Apple users may not see a WhatsApp version, either. According to WhatsApp CEO Jan Koum, Apple’s “platform limitations” currently prevent the desktop version from being available to iOS users, and could even be why Safari is left hanging.