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並前往https://faq.whatsapp.com/general/contacts/how-to-add-an-international-phone-number/?lang=en

How to add an international phone number - WhatsApp FAQ

For example, if a contact in the United States (country code "1") has the area code "408" and phone number "XXX-XXXX", you'd enter +1 408 XXX XXXX.

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