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Using Send to Chat - This is a free feature allows you to begin a chat with someone without having their phone number saved in your phone's address book. As long as you know this person’s phone number, you can visit this page that allows you to start a chat with them. By clicking the send button, a chat with the person automatically opens. Click to Chat works on both your phone and WhatsApp Web.

Now with easy way to chat just go home page and enter phone number and make sure country code is correct.