Change phone number

How do i change my phone number without having acces to the old one?

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I need to know the same info! When I try to open Mw it says to verify my account, but my account is verified on battlenet and Activision. I’ve also made a ticket a day ago and haven’t seen or heard anything back. I do have a new number I need to switch it to and don’t have access to my old number but the phone number is verified so I don’t know why I can’t play MW even though everything is verified