Originally posted by JeLLyBeAn:

Phone Number

How can I change my phone number if I do not have access to my old phone number and Steam Guard?

Help! I sold or lost my phone and I can't log in anymore! What do I do?

If possible, you should contact your wireless service provider and get a replacement phone with the same phone number. Steam will be able to send SMS messages to your replacement phone, and you will be able to recover your account as described below.

If you no longer have access to your phone and don't have your recovery code, you'll need the assistance of Steam Support. Use the "Help me with my issue" button at the top right of this page to get help removing your authenticator. If you don’t have access to the email address that is currently associated with your Steam Account please provide proof of account ownership within your ticket.