Note- You don't need to root your android device to run dual whatsapp account.But this technique will run on a rooted device also.
Steps to do-
1- You have to download an apk file of an application named as Whatsmapp. Click here to download whatsmapp apk. Remember it must be of 21.1 MB otherwise it will not work properly.
2- After completing the installation run the application and enter your mobile number which you want to run as secondary number and they will send you OTP on your number for verification.You have to enter that OTP in the space given.Remember your original whatsapp is still running with your first number,don't uninstall it.
3- Now you are running two whatsapp accounts.One in your original whatsapp and other in whatsmapp.
1- Android mobile
2- Good connection of internet
3- Good understanding power
4- Whatsmapp apk
Click here to download whatsmapp apk.
Remember- Whatsmapp is third-party application and it doesn't have any contact with the Whatsapp community.
Congratulations,now you are running two whatsapp accounts in single android mobile.