About using one WhatsApp account on multiple phones, or with multiple phone numbers
Your WhatsApp account can only be verified with one registered phone number. If you have a dual SIM phone, please note that you still must choose one number to verify with WhatsApp. There is no option to have a verified WhatsApp account with two different phone numbers.
You can switch your WhatsApp account to a new phone without receiving an SMS code.
If your phone number is eligible, you can verify it using your old device. WhatsApp will send a push notification to the old device that will provide the 6-digit code to enter on your new device.
If you don’t choose this option, you’ll be prompted to verify your phone number via SMS.
If you attempt to frequently switch your WhatsApp account between different devices, at a certain point, you may be blocked from re-verifying your account. Please don't repeatedly switch between different devices and numbers.