Resource note
Resources / Mobile & Telecom
A phone-number transfer or SIM change can redirect calls and text codes to a device controlled by someone else. If you rely on a phone number for account recovery, review the carrier account as part of your recovery plan.
Check these settings with your carrier:
- Set a unique account PIN or passcode and ask how it is used to approve account changes.
- Turn on a number-transfer or port-out lock if the carrier offers one.
- Ask whether the account can notify you about a SIM change or transfer request.
- Change default voicemail credentials if the service uses a PIN.
- Review which important accounts rely on SMS recovery and add another recovery method where available.
Features and names differ by carrier and plan. A PIN or transfer lock does not stop every form of impersonation or prevent compromise of the carrier's own processes. Contact the carrier using a number or support channel from its official website if you see an unexpected service change.