You have a terrific telephone number that you want to use on WhatsApp. Because NumberBarn and NumberGarage numbers are classified as landline/wireline, they are no longer compatible with WhatsApp service. Many VoIP numbers used to work on the platform but no longer do.
How to change your WhatsApp number
Learn more in this article from WhatsApp about changing your number:
If you want to use your new number on Whatsapp, you need to port the number to a wireless carrier or use a different telephone number that is already wireless. The above article clearly states that WhatsApp doesn't support VoIP numbers.
I ported my number to a wireless carrier but it still doesn't work on WhatsApp
If you ported your number to a wireless carrier and it's on an active SIM card, you should be able to add it on WhatsApp. If you are unable to do so, you will need to contact WhatsApp support for assistance. Our best guess is that WhatsApp still thinks your number is wireline even after it was converted to wireless. Learn more in this article: