How to register phone number on WhatsApp?#
To use the GREEN-API service, you need to have a number registered in WhatsApp.
1. Registration requirements#
To register on WhatsApp you need to meet next requirements:
-  Make sure you’re using the latest version of WhatsApp installed on your phone. 
-  You can only register a phone number you own. 
-  You need to be able to receive phone calls and SMS to the phone number you are trying to register. You need to disable any call-blocking settings, apps or task killers. 
-  If you wish to use both WhatsApp Business and WhatsApp, you need to use a unique phone number for each app. 
-  You’ll need to use a supported phone number. Unsupported phone numbers can’t be registered on WhatsApp. 
The list of unsupported numbers
-  VoIP numbers (telephone number operating on an internet connection) 
-  Landline numbers (Note: Landline phone number can only be registered in WhatsApp Business app) 
-  Free access numbers (8-800) 
-  Rooms with paid incoming calls 
-  Universal Access Numbers (UANs) 
-  Virtual numbers 
2. Registration methods for WhatsApp#
WhatsApp offers two ways to register on its platform: registration via SMS and registration via phone call.
Registration via SMS#
-  Choose your country from the drop-down list. This will automatically fill your country code on the left. 
-  Enter your full international phone number in the box on the right. Don't put 0 before your phone number 
-  Tap Next to request a code. WhatsApp usually sends the verification code via SMS or automated voice call from a phone number with the country code for the country you are registering from. 
-  Enter the 6-digit code you receive via SMS. 
-  After registering, add your email address to your account at any time in your WhatsApp Settings>Account>Email Address. This helps you access your account next time you log in.
Registration via phone call#
-  Tap Voice Call on the registration screen in WhatsApp. You’ll receive a call from WhatsApp. 
-  Answer the call and you’ll get an automated message with a unique code. 
-  Enter the code when prompted to complete registration.