How to use two Whatsapp in one mobile.
(NO ROOT NEEDED)

1. First take full backup of your whatsapp by going to your whatsapp settings.

2. Clear Whatsapp Data By Going to Settings>apps>

3. Go to Filemanager>Sdcard>Whatsapp Folder and rename this folder to /Sdcard/OGWhatsapp.

4. Uninstall your previous or official whatsapp by going to settings>apps>whatsapp>uninstall.

5. Install OG whatsapp if you don't have og whatsapp app then you can download it by google links.

6. After installing Og whatsapp it will ask you to enter mobile no. enter your previous mobile no   from which you have registered on your official whatsapp app.

7. After entering your mobile no. Click Ok.

8. Now your Og whatsapp is ready with your old no.

9. To use second no. Headover to play store and download official whatsapp application.

10. After installing it will ask you for mobile no. Now enter your new mobile no.

11. Click OK.

That's it now you have two whatsapp accounts on a single phone