How do I log into icloud on a new device with new phone number if it sends a 2 factor authentication code to my old phone number?

Hi, like the title says How do I log into icloud on a new device with new phone number if it sends a 2 factor authentication code to my old phone number?

I activated my apple id from a phone number I do not use or have access to anymore and now when I log in on another device or online it sends a 2 factor authentication code to my old phone number. Was wondering how I go around this to log in or even cancel my user id. Thanks