Q: Changing # for Sec Code?

Hello REDallas,

Thanks for using Apple Support Communities.

If you do not have access to the phone number you configured iCloud Keychain with, you will need to contact Apple Support in order to continue.

 

• The device that is using the SMS-capable phone number you provided when you first set up iCloud Keychain. A verification code is sent via SMS to this phone number. If you can't access this number, contact Apple Support, who can verify your identity, so that you can complete setup on your new device.

Frequently asked questions about iCloud Keychain - Apple Support

Take care,

Alex H.