All you need is an internet connected smartphone, tablet or i Pad.
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Simply tap the ellipse (...) or option icon and select ‘Request desktop site’ and the page will switch to the desktop mode where you can scan the QR code.
Open Whats App on the phone that is presently registered with Whats App and scan the QR code and your second smartphone or tablet will give you access to the same Whats App.
Also Read: How to get the latest Whats App update before your friend In order to use Whats App from a mobile, you need a second smartphone with data or Wi-Fi connected.
For an Android tablet, simply follow the steps ahead.
You may also try to connect from another Wi-Fi spot.
Maybe there is a temporary problem in your wireless carrier's network or in Wi-Fi zone you are using now.
You may enter your e-mail for Push-to-Email under "Settings" – "Notifications" - "PUSH-TO-EMAIL".
Whats App, the most commonly use and powerful messaging application for mobile devices has a limitation in itself.
It can only be used on a single device at any given point of time.
As a consequence of this, WLM/MSN is no longer functional in IM and will be removed in future versions.
Sources: Microsoft, Wikipedia, Please check if you have active internet connection and if other internet applications on your i OS device work at the moment.