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Having an up-to-date, accurate cellphone number on your account is essential to account security, and it enables you to receive validation codes and activate/deactivate up to two devices and/or web browser sessions on your account.
If the cellphone number is outdated or you don't recognize it, we recommend checking with friends and family members. You should also make sure that you are logged out of any public computers that you may have used.
Then, please contact us at firstname.lastname@example.org to change the cellphone number on your account. You will then be able to verify the number, authorize your device or web browser session, and change the password on your account to one that you've never used before on any other website.