There are many other ways online to achieve this but not all the methods are safe, effective or even efficient. But with GBWhatsapp, you are good to go. Safe, simple, proven and efficient. You dont even need to root your phone.
Just install and verify like the normal WHatsapp. Thats it.
See this tutorial How To Install and Use 2 (Dual) WhatsApp Apps in One Phone on HOWTUTOR on how to install the two apps (the normal and the second WhatsApp) on your phone.
To download the normal WhatsApp, please visit your cirresponding mobile appmarket - Google Play Store for Android. But to download the latest version of GBWhatsApp, click here.
Enjoy.
Please share this info with friends and family and also share your comments and experiences using it below.