issues logging into my icloud
i need to update my phone number on my icloud so i can log into it. im unable to sign into my icloud because they’re sending the verification code to a unresponsive phone/number
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The Apple ID say example1@icloud.com exists on server and you know the password and its account credentials , however that is signed in the device iPhone .
If you don't remember the trusted number and yet it is verified in the account , visit your cellular service centre with personal identification proofs , the number can be obtained from them .
If the account is set with two factor authentication from iPhone .
Issue a sim on behalf of the same number and insert the sim Set up cellular service on iPhone - Apple Support
In a new iPhone that is purchased Turn on and set up iPhone - Apple Support
The Apple ID and password is active so is the 2FA active on the iCloud server , once a new trusted number is added the code will start appearing on the new trusted number , and the person can access the account .
See the article Get a verification code and sign in with two-factor authentication - Apple Support
Then access the account and remove an old inactive verified number from the account .
Go to your Apple ID account page and enter your Apple ID and password.
In the Security section, click Edit.
Click Add a Trusted Phone Number.
To add a number, enter the phone number and verify it with a text.
To remove a number, click cross sign next to the phone number you want to remove.
Note : you don't need account recovery from the server as Apple ID and password are known to you How to use account recovery when you can’t reset your Apple ID password - Apple Support