Use WhatsApp in multiple phones officially/legally

We all permitted to use WhatsApp in single phone at a time. This can be a con for those who use multiple devices for their daily use. But WhatsApp can be used in more than one devices from a simple trick. This trick is based on an official feature provided WhatsApp, that is 'WhatsApp Web'.

WhatsApp Web is very useful when you are unable to use your phone for any reasons or if want to send a photo or video or any files which is stored in your computer. Fortunately, WhatsApp Web is supported by most of all browsers.

These are the steps to use WhatsApp in another device:

Lets take if you want to use your WhatApp account in friend's phone...

Step 1: (In your friend's phone)

Open a browser (Google Chrome is recommended) in the phone you want to use another WhatsApp and go to web.whatsapp.com.

WhatsApp website will detect that you are using a mobile device, so it will redirect to WhatsApp homepage.

For this, just go to menu of the browser and tick 'Request desktop site'.

WhatsApp Web on Google Chrome

If still it is not coming up, I would recommend to use the below link.

https://web.whatsapp.com/🌐/en

A QR Code will show up.

Step 2: (In your phone)
Open your WhatsApp application, click on menu button (usually 3 dots in the top right corner) and select WhatsApp Web.
A guide page will open, just click 'OK, GOT IT'.

WhatsApp Web option on Android

Step 3:

Scan the QR Code generated in Step 1. WhatsApp Web version will automatically open in the browser of your friend's phone.

Yes... You are done. Now WhatsApp can be used in both the devices. 

Use WhatsApp Web in landscape mode for best experience. 

This trick can be used to hack into your  friends' WhatApp. Just scan QR Code in your browser using friend's phone in a second. It will work as long as your friend is connected to network.

Please let me know in the comment box if you have any doubts or suggestions/clarifications.