In order to remove your old phone number Steam Support needs to re-verify your account ownership.
Please provide us with as much of the following information as possible to help us with removing your old phone number.
Please provide the current phone number on your account
What was the first email you used on your account?
Try to give the earliest if you can't remember the first.
If you've used a PayPal account with your Steam account please provide the following information:
ชื่อผู้ถือบัญชี PayPal
PayPal Invoice ID of a Steam purchase
ตัวเลข 16-18 หลัก เป็นตัวเลขเท่านั้น
Address associated with PayPal account
Please include any additional information that would help us verify your account ownership.