What is the maximum number of phone numbers you can register to one WhatsApp Business Account (WABA)?

By default, you can register a maximum of 25 phone numbers per WABA. You can submit a request, with an accompanying business case, to Meta to increase this limit. If your business case and request are approved, your limit will be increased. This process can be repeated until you reach a maximum of 120 phone numbers registered to a single WABA.

Learn more about the Sinch WhatsApp Business API.