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, which says it has more than 3 billion users globally, has until now allowed users to be contacted by anyone who has their phone number.

The app, owned by , said in a blog post that over the “coming months” users will get the option to be found and contacted only by their username, and not their number. It wasn't more specific about the timeline.

“We have designed this as a core privacy feature,” Alice Newton-Rex, WhatsApp's vice president of product, told reporters.

There won't be a directory of usernames on the app, and the app won't suggest names as you type.

“People will need to know your exact username to contact you for the first time,” she said.

WhatsApp's current privacy settings are limited to blocking individual users and silencing unknown callers. The app also allows users to add a profile name, but that's only displayed in chat groups for other people who don't have the user's contact info saved.

While Americans still prefer to WhatsApp, the app is widely used in Europe, Asia and much of the rest of the world.

Catchy online handles are highly coveted and users will likely scramble to claim a desirable one.

“I think a lot of people will go and get usernames and that’s why we decided to open reservations early,” Newton-Rex said.

Companies, organizations and creators with existing accounts on Meta's social media platforms, and , will get the chance to claim their usernames on WhatsApp.

Usernames need to be between three and 35 characters. To prevent impersonation, WhatsApp will hold back usernames for high-profile people or groups such as celebrities, public figures and government entities.