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If you run an Instagram shop or Facebook page, you can carry that handle to WhatsApp through Meta Accounts Center. Here's how, who it's for, and the catch.

WhatsApp's optional username key is a short code strangers must enter to message you. Here's how it differs from your username and when to turn it on.

Every WhatsApp username rule in plain English: length, allowed characters, the letter and period rules, and anti-impersonation limits, with valid vs invalid examples.

Reserve your WhatsApp username today on iOS or Android. What "reserve now, use later" means, the naming rules, and how to pick a handle before your country goes live.