Run multiply whatsapp account on your smartphone

This is most wanted WhatsApp trick as many users have dual-SIM support in their smartphone
and they want to run separate WhatsApp account from both SIM card numbers at the same phone.

For this, install SwitchMe App.
The app lets you to create separate use profiles on your smartphone which can have different accounts, system settings, apps and data.
After installation, open SwitchMe and create a new user profile.
Shift to this user profile and you can connect WhatsApp with your second SIM card number.