Based on reporting by The Hacker News →
Introduction
After years of speculation, WhatsApp has officially begun global username reservations, allowing users to connect without sharing their phone number. For over three billion users, this optional feature is a significant step toward reducing the surface area for mass data scraping and targeted harassment.
The problem
According to reporting by The Hacker News, WhatsApp announced on Monday that username reservations are starting to roll out globally. The feature is optional and designed to let users connect on the platform using a username rather than directly exposing their phone number. This change aims to protect the privacy of more than three billion users by giving them a way to interact without broadcasting their personal phone numbers.
Consequences
Without this feature, any user who knew your phone number could potentially initiate contact, attempt to pull profile data, or combine that number with leaked databases from other services. Even if you never shared your number in a group, it was effectively your public identifier. The new username system reduces the attack surface for direct identity mapping, scraping, and social engineering that begins with a phone number. However, it does not automatically make any account secure—it only reduces one vector.
Causes
The primary cause driving this change is the persistent privacy risk of phone-number-as-identifier. Over three billion users have been forced to share a highly sensitive piece of personal data—a phone number—just to start a conversation. This design made WhatsApp a rich target for data brokers, stalkers, and scammers who could harvest numbers from groups or public profiles. The underlying cause is a decades-old choice to anchor identity to a static, non-revocable credential (the phone number) rather than a changeable alias.