Using Click to Chat URL on websites or instagram.
WhatsApp's Click to Chat 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 create a link that will allow you to start a chat with them. By clicking the link, a chat with the person automatically opens. Click to Chat works on both your phone and WhatsApp Web.
To create your own link,
[where the <number> is a full phone number in international format.]
For a detailed explanation on international numbers, read this article. Please keep in mind that this phone number must have an active account on WhatsApp.
Don't use: https://wa.me/+234-(810)0681220
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