This method does work although it may not be the most elegant of solutions. In order to make it work, all you need is an active internet connection on the second phone. It also works without a SIM card.

  1. Type web.whatsapp.com on the mobile browser of the second phone that you want to also use WhatsApp on.
  2. It will automatically redirect you to the WhatsApp home page. Select “Request desktop site” (this could differ from browser to browser) from the browser options. It will then prominently open up the desired Web page with a QR code displayed on it.
  3. Go to options/settings and select “WhatsApp Web” (note that you will have to log out before proceeding, if you are already using WhatsApp Web on any other browser) on the phone that has WhatsApp installed and running. It will fire up the QR scanner.
  4. Now, using the WhatsApp app on the first, scan the QR code displayed on the second phone. This will automatically log in with your account to WhatsApp Web on the second phone. You can now use WhatsApp on both the phones simultaneously. However, the twist is that other than the primary phone on which WhatsApp is installed, you can use this method to use WhatsApp on only one additional device. You will have to log out from one device, in order to use it on another device. Please note that WhatsApp Web isn’t a full-feature replacement for the installed version of WhatsApp. Also, the interface is not the best for mobile use and you wouldn’t get notifications. For a fuller view, you may want to switch to landscape.