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How can I change my phone number to receive SMS authentication messages?

The mobile two-factor authentication via SMS is temporary and will be removed once you activate one of the digital or physical security devices.
For this reason, it is not possible to change the phone number on which to receive SMS authentication messages or re-activate authentication via SMS once it has been replaced by a permanent security device.

For information on how to proceed, please see How do I request a security device?

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