Can you call the WhatsApp number that's already registered to use WhatsApp Business API?

No. If you place a WhatsApp call to a number using the WhatsApp Business API, it will appear to be invalid as the screenshot below.

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• Could I still use WhatsApp Messenger App and WhatsApp Business App?

  Once the number is registered with WhatsApp Business API, you will not be able to register the same number for normal WhatsApp apps.

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  Yes, you can still use the connected WhatsApp number to make phone calls.

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• What is WhatsApp Business API?

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• What countries can I reach with the WhatsApp Business API?

  WhatsApp Business API allows you to reach just about every country in the world, all WhatsApp-enabled phone numbers have the ability to communicate with WhatsApp end users in any supported country. This is enabled by default, without the need to ...