WhatsApp has begun turning away logins from phones running outdated software. Affected users now see a screen telling them to update their operating system before they can get back into their account.

The change is a server-side update, so it does not depend on which version of WhatsApp is installed. It is reaching specific users on both Android and iOS, and the company has not said which OS versions trigger the block.

What do users see when WhatsApp blocks a login?

According........

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