Twitter has announced that users will now be required to pay for text-based two-factor authentication. This means users will no longer be able to use SMS for two-factor authentication.

According to Twitter, only paid subscribers will be able to use texts for two-factor authentication. This move is in response to security concerns, as SMS is vulnerable to hacking.

Twitter has recommended that users turn to Google Authenticator for two-factor authentication. Google Authenticator is a free app that generates a unique one-time code for users to use when logging in.

Twitter has also announced that it will be offering additional security features for its paid subscribers, such as the ability to require a second authentication code when logging in from a new device.

The new changes are expected to take effect in the coming weeks. Users who have not already done so should take the time to set up two-factor authentication with Google Authenticator or another secure method.