How to Use Two WhatsApp Accounts on One iPhone
Go to the App Store and type 'WhatsApp Business'
Now click and install the WhatsApp Business app from the App Store.
Now install the WhatsApp Business app from the App Store.
After it gets installed, open and create your WhatsApp account with a secondary phone number.
The registration process is just like the regular WhatsApp login.
Follow the on-screen instructions and complete the setup process.
After the number is registered, enter your name, and other details; this will complete your profile.
This will allow users to access each of the WhatsApp apps for a different number.