Overview
- On Monday, multiple reports showed WhatsApp began a server-side rollout that displays a full-screen lock and refuses login when it detects a strongly outdated mobile operating system.
- The restriction is enforced server-side at connection time and does not require users to update the WhatsApp app from an app store to take effect.
- WhatsApp frames the move as a security requirement because known OS vulnerabilities can let malware read data before the messenger’s end-to-end encryption becomes effective.
- Users cannot skip the prompt and must install system updates through the phone’s official settings, and devices that no longer receive OS updates may be permanently unable to use the app.
- The change is being applied in waves on iOS and Android and is part of a broader hardening effort that includes warnings about unofficial clients, fraud protections, and passkey support, though WhatsApp has not published exact OS version thresholds that trigger the block.