WhatsApp Usernames Explained: How to Hide Your Phone Number from Businesses in 2026

Later in 2026, WhatsApp users can set a username (like @yourname) and hide their phone number from businesses. Businesses will see your username and a behind-the-scenes code instead of your number. It's optional — if you don't set a username, nothing changes for you.

What Is a WhatsApp Username?

A WhatsApp username is an optional, unique handle you choose — like @sarah_designs or @coolcoder99. Once set, businesses you chat with see your username instead of your phone number, giving you more control over your privacy.

Think of it like choosing a gamertag or an Instagram handle — except this one protects your real phone number every time you message a business on WhatsApp.

Do I Have to Set a WhatsApp Username?

No. WhatsApp usernames are completely optional. If you don't set one, everything continues working exactly as it does today — businesses will still see your phone number when you message them.

But if you value your privacy — especially when messaging businesses you don't fully trust — a username gives you that extra layer of protection.

What Are the Rules for WhatsApp Usernames?

WhatsApp usernames must be 3–35 characters, contain only English letters (a–z), numbers (0–9), periods (.), and underscores (_), include at least one letter, and cannot start/end with a period, have consecutive periods, start with "www," or end with .com/.org/.net.

• Capitalization doesn't matter — MyName and myname are the same username.
• Periods and underscores DO matter — my.name and my_name are different usernames.
• You can only have one username at a time, but you can change it periodically.
• No special characters like ñ, é, or ü — English letters only.

What Happens When You Set a WhatsApp Username?

When you set a username, new businesses you message will see your username and a behind-the-scenes code (called a BSUID) instead of your phone number. Your personal chats, phone number, and conversation history are unaffected.

What changes:

• Your phone number is hidden from new businesses. They'll see your username and a unique code — not your real number.
• Businesses need your permission to see your number. They can send you a "Share contact info" button. You choose whether to tap it or not.

What stays the same:

• Personal chats are unaffected. This only changes how businesses see you.
• Your phone number stays on your account. You're just choosing not to show it.
• Changing your username doesn't disrupt anything. Conversations, history, and account all remain intact.

What Is a BSUID? (The Code Behind Your Username)

A BSUID (Business-Scoped User ID) is an invisible code that WhatsApp generates for every user–business pair. You'll never see it — it works behind the scenes so businesses can recognize you and reply to you without knowing your phone number. Each business gets a different code for you.

Here's the privacy benefit: if you shop at three different stores on WhatsApp, each store gets a different secret code for you. Store A can't use their code to figure out that you also shop at Store B. Your identity stays compartmentalized across businesses.

What If a Business Asks for Your Phone Number?

Businesses can send a "Share Contact Info" button in their messages. If you tap it, your phone number is shared with them. If you ignore it, the business can only communicate with you via your username and BSUID. It's entirely your choice.

Some businesses — like delivery services or banks — may genuinely need your phone number to serve you. But you always get to decide. No business can force you to share it.

Will Businesses Still See My Phone Number in Some Cases?

Yes. Even with a username, your phone number may still be visible to a business if you've exchanged messages or calls with them in the last 30 days, or if you're stored in their contact book (a new Meta feature). The privacy benefit is strongest with new businesses you haven't interacted with before.

What Happens If I Change My Phone Number?

If you change your phone number, your behind-the-scenes BSUID changes too, but your username stays the same (unless you choose to change it separately). Businesses get a notification that your identifier has been updated.

When Are WhatsApp Usernames Available?

WhatsApp usernames are launching later in 2026. The behind-the-scenes BSUID system started rolling out to businesses in March 2026. You'll be able to set a username once WhatsApp makes the feature available in your region.

The Bottom Line

WhatsApp usernames are a major privacy win. You get to decide which businesses see your phone number and which ones only see your username. There's nothing you need to do right now, but when the feature launches, it's worth setting up if privacy matters to you.