Use two whatsapp account with one device

Method – 2 : Without Rooting

If you do not want to root your phone and make it more simpler and safer to do this then follow this method.
You will have to install an app called as OGWHATSAPP, this is unofficial whatsapp which works similar to original one and lets you use 2 accounts in single android device.
Follow these steps carefully now :-

       Open up the existing Whatsapp in your device and take a full backup of your conversations.

• Now navigate to Setting >> Applications >> All >> Select Whatsapp and clear all data.
• After you have cleared the data go to your SD card and rename the Whatsapp folder to OGWhatsApp.
• Now uninstall the currently installed Whatsapp account from your device.
• Install OGWhatsapp from HERE.
• That is it, now OGWhatsapp will use your old phone number.
•  Now to use secondary whatsapp account go to Google Play Store and download the official whatsapp from there.

This was it, now you have got two whatsapp accounts on a single android device