Phone Number Rules to Apply for WhatsApp Business API

Dedicated Phone Number

The phone number must be dedicated exclusively to your WhatsApp Business API account. It cannot be used simultaneously on the WhatsApp Messenger or WhatsApp Business App. Using a number already linked to another WhatsApp account can cause setup conflicts and delay approval.

Fresh or Converted Number

You can Either use:

• A new number that has never been registered on WhatsApp.
• An existing number, after permanently deleting the WhatsApp account linked to it.
• Once deleted, the number becomes eligible for API verification.

Active and Accessible

The number must be active and capable of receiving SMS or voice calls, as WhatsApp sends a verification code during setup. Without access to the code, verification cannot be completed.

International Format

Numbers must be entered in international format, including the country code. For example, an Indian number would be +91 9876543210. Correct formatting ensures messages and verification codes are delivered properly.

One Number per API Account

Each phone number can only be linked to one WhatsApp Business API account. It cannot be used for multiple accounts, even for different departments or brands.

Long-term Use

Choose a number that can be maintained long-term, as frequent changes can confuse customers and affect credibility. Once registered, the number becomes your official WhatsApp communication channel.

Conclusion

To summarize, WhatsApp Business API requires a dedicated, active, and correctly formatted phone number that is either new or cleared from previous WhatsApp use. Following these rules ensures smooth verification and allows your business to start engaging customers quickly and securely.