My Apple Account’s Trusted Phone Number Was Changed—How Can I Recover It?

This likely means the attacker gained control of the account’s recovery or verification process, especially if a recovery request was started. Check your email for the original security notices and use only official Apple support channels. If your phone number or SIM may have been targeted, contact your mobile provider and add extra account security to prevent a number takeover.

If you don’t have a trusted Apple device already signed in and no longer control the trusted phone number, the normal route is Apple’s account-recovery process. Recovery may be difficult or unsuccessful without access to either of those verification methods, so start the process through Apple’s official account-recovery page and contact Apple Support if you’re unable to proceed. Also secure the email account associated with the Apple Account and change any reused passwords.