About registration | WhatsApp Help Center
https://faq.whatsapp.com/441163784889902
Open WhatsApp and follow the steps to begin registering your phone number on Android or iPhone. After you enter your phone number, you'll receive a 6-digit registration code via SMS. If you don’t receive your SMS code, our automated system can call you with your code. Depending on your carrier, you might receive charges for SMS and phone calls.
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