How to change my previous mobile number to the new one?
I need to update my mobile number. The old number is no longer available. I cannot retrieve all the photos and videos on my previous iCloud account and apple id
iPhone 11, iOS 15
Question marked as
Best reply
Hi nevermind11,
Welcome to the Apple Community
Apple Support's article: "Two-factor authentication for Apple ID"
says:
Update your trusted phone number on your Apple ID account page
- Go to appleid.apple.com.
- Sign in with your Apple ID.
- Go to the Security section and click Edit.
If you want to add a phone number, click Add a Trusted Phone Number and enter the phone number. Choose to verify the number with a text message or automated phone call, and click Continue.
To remove a trusted phone number, click 
next to the phone number you want to remove.
The Complete article: https://support.apple.com/en-us/HT204915
Hope this works ok for you.
All the best :-)