WhatsApp is a popular messaging app that allows users to communicate with friends and family. If you own two different phones and want to use Whatsapp on both, there are a few steps you can follow. 

First, make sure you have a WhatsApp account on your Primary Phone. Then, download WhatsApp on your secondary phone and sign in using the same phone number and verification code as your primary phone. This will allow you to access your WhatsApp account on both phones. 

However, it's important to note that you can only use WhatsApp on one phone at a time. If you're using WhatsApp on your primary phone and then switch to your secondary phone, you'll be logged out of WhatsApp on your primary phone. To avoid this, make sure to log out of WhatsApp on one phone before logging in on the other. 

In conclusion, using WhatsApp on two different phones is possible by downloading the app on both devices and signing in with the same phone number and verification code. However, it's important to remember that you can only use WhatsApp on one phone at a time and to log out of the app on one phone before logging in on the other.