In short#
WhatsApp in EVA is a Business Account. It is not the app on your phone.
I often recommend the EVA number already listed in Settings → Phone → Lines. If you cannot read the verification SMS, an Eva representative can receive it with you.
Business account vs phone app#
I work with a WhatsApp Business Account in EVA.
The WhatsApp app on your phone is a different product.
A number that is active in the WhatsApp Business app on a handset cannot stay there and also be registered for EVA at the same time.
You usually leave your personal phone app as it is.
For EVA, pick a number that is free for registration.
Which number to choose#
Start with the EVA number already listed in Settings → Phone → Lines.
That number is often the best option when it is still free.
Free means it is not already used in the WhatsApp Business app and not already registered in another WhatsApp Business setup.
Lines are assigned by your partner. You cannot add or change them from the workspace.
If you need another line, contact your partner.
Verification SMS#
Meta sends an SMS code during registration.
Someone must be able to read that SMS on the selected line.
If you cannot access SMS on that line, ask an Eva representative to receive it and finish registration with you.
Next#
Once your number is chosen, continue with Connect WhatsApp.
WABA ID entry is covered there.