Protect your number at the carrier and reduce the accounts that depend on SMS codes. Set a unique carrier-account PIN or password, enable the carrier’s SIM-change and number port-out locks if available, and switch sensitive accounts to an authenticator app or security key where supported. These steps lower risk but cannot guarantee that a SIM swap will not happen.
What a SIM swap can expose
A SIM swap is a carrier-side transfer of your phone number to a SIM or device controlled by someone else. The person who takes control may receive calls and text messages sent to your number, including SMS verification codes, and may try to use the number to recover accounts. The FTC explains the scam and consumer response at its SIM-swap guidance; the FBI’s Internet Crime Complaint Center also describes these schemes in its 2024 advisory.
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Lock down your carrier account
Use a strong, unique PIN or password for carrier account access and customer-service changes. Do not reuse a PIN from a bank, email account, or another service. Then ask your carrier to enable both protections below, using a verified support channel or the carrier’s official account settings.
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- Port-out lock: restricts an unauthorized transfer of your number to another carrier.
A port-out PIN and a carrier account lock are not necessarily the same control; ask what each setting does and confirm both are active. In the United States, FCC rules require covered wireless providers to offer customer account locks for SIM changes and port-outs at no cost. The FCC’s 2023 final rule took effect January 8, 2024, with specified information-collection provisions delayed. Providers have flexibility in implementation, so names and activation steps can differ. These U.S. requirements should not be assumed to apply elsewhere.
#1 Best Overall
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Replace SMS verification on important accounts
Review the sign-in and recovery settings for your primary email, banking, payment, and social accounts. Where a service supports it, choose a method that does not deliver the code to your phone number. The FTC compares SMS codes, authenticator apps, and security keys.
| Method | SIM-swap exposure | What to plan for |
|---|---|---|
| SMS code | A person controlling your number may receive the code. | Use another available method for sensitive accounts. |
| Authenticator app | Codes are not delivered through your number, so this method is not exposed to a SIM swap in the same way as SMS. | Set up account recovery for a lost or replaced device; store backup codes securely if the service provides them. |
| Security key | Not dependent on receiving a code at your number. | Use only where the account supports the key, and confirm compatibility and recovery options before relying on it. |
No single authenticator brand is established as best by these sources. Keep recovery details current so a lost device does not leave you locked out. The FTC also recommends multifactor authentication because it adds protection beyond a password alone.
Rank #2
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Make impersonation harder
- Do not give carrier, banking, or verification details in response to an unsolicited call, text, or email.
- If a request might be genuine, independently open the service’s known website or call a number you already trust; do not use contact details supplied in the unexpected message.
- Limit personal details posted publicly, especially information that could help someone impersonate you with a carrier.
The FBI’s 2024 IC3 advisory and its 2022 public service announcement describe social engineering and the misuse of identifying information in these schemes.
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What to do if your phone suddenly loses service
An unexpected loss of mobile service can be a warning sign of a SIM swap or number port, but it can also have other causes. Check with your carrier rather than treating the outage alone as proof.
Rank #3
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- Use another phone or an internet connection to contact your carrier through a known official channel. Report a suspected unauthorized SIM change or port, ask to restore control of the number, and secure the carrier account. Document the incident and follow the carrier’s reporting process.
- Once you can access your accounts, change passwords for important services, starting with email and financial accounts. Review recovery details and sign-in activity where available.
- Check bank, payment, and other financial accounts for unfamiliar activity. Contact the relevant institution promptly about suspicious transactions or account changes.
- If personal information such as a Social Security number or financial-account number may have been exposed, use IdentityTheft.gov for tailored recovery steps.
Carrier recovery timing and procedures vary; do not assume the number can be restored on a particular schedule.
Quick Recap
Rank #4
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