Thread by @jaxoncoder

WhatsApp just gave 3 billion people the chance to claim their username.

This update is way bigger than it looks.

Here's what changed and how to lock yours in:

1/ No More Phone Numbers

For the first time, people won't need your phone number to message you.

All they'll need is your username.

You keep your number private and still stay reachable.

2/ Claim Yours Before Someone Else Does

Usernames are first come, first served.

Update the app → Settings → Account → Username → pick a name up to 35 characters.

Do it now before someone takes the handle you want.

3/ Grab Your Instagram Handle

Already have the name you want on Instagram or Facebook?

Meta is letting verified creators and businesses claim their existing handle on WhatsApp too, if it's still available.

Same name, all three apps.

4/ Turn On Your Username Key

Add a PIN so strangers can't message you just by knowing your username.

Update the app → Settings → Account → Username → Username Key → set a 4-digit code → turn on "Require key to message."

Now anyone starting a new chat has to enter that code first.

5/ Lock Down Who Can Reach You

Control exactly who gets through.

In the same Username Key menu, toggle on "Ask for key from people who aren't in my contacts."

Your existing contacts skip it.

Strangers get blocked unless you hand them the code.

Change or remove the key anytime without ever touching your username.

6/ Celebrity Names Are Locked

WhatsApp is holding back the handles of major public figures and officials to stop impersonation.

Verified creators and businesses coming from Facebook and Instagram get first claim on theirs.

7/ Businesses: Numbers Are Changing

For companies, this quietly rewrites how customer identity works.

Meta is moving WhatsApp from a phone-number-only system to a hybrid one.

When a customer messages you by username for the first time, their real number stays hidden.

8/ Meet The BSUID

Instead of a phone number, WhatsApp hands your business a unique string called a Business-Scoped User ID.

That same customer messaging a different company gets a totally different ID.

It stops businesses from cross-referencing or tracking people across platforms.

9/ What Businesses Have To Fix

Since phone numbers aren't guaranteed anymore, any business on the WhatsApp Cloud API has to update their CRM, routing, and chatbots to recognize and log BSUIDs.

Skip it and your conversations break.

10/ The Guardrails

You still can't be spammed cold.

Businesses can't take a list of public usernames and blast marketing at them.

Every conversation still has to be started by the customer.

And if you've talked to a business in the last 30 days, they keep access to your number.

Save this thread. Which prompt did you find most valuable?

WhatsApp finally moving to usernames is a much bigger shift than most people realize, especially for privacy and how businesses will need to adapt their systems going forward. Did you already claim your username?

WhatsApp usernames finally rolling out is one of those quiet updates that will quietly reshape how people connect and how businesses operate. The shift from phone numbers to usernames changes privacy, discoverability, and even how companies will have to manage customer conversations going forward.

Did you claim your username yet or still thinking about the right one?