Topic
What is a SIM swap?
Last reviewed:
- Quick fact 1
In a SIM swap, a scammer gets your phone number moved to a SIM card on a phone they control.
- Quick fact 2
Text-message codes can be intercepted after a SIM swap.
Source: FTC: Use two-factor authentication to protect your accounts
- Quick fact 3
An authentication app or a security key is safer than text-message codes.
The short lesson
Your phone number is often the key to your other accounts. Text codes, password resets and account alerts all go to it. In a SIM swap, a scammer convinces your phone company to move your number to a SIM card they control.
Once they have your number, they can receive your text codes, reset your passwords and log in to your email and crypto exchange accounts.
Warning signs:
- Your phone suddenly has no service and you did not change anything.
- You get a notice that your SIM or number was changed.
- Password reset emails you did not ask for.
Protect yourself:
- Set a PIN or passcode on your phone account with your carrier.
- Use an authenticator app or a security key for email and crypto accounts, not text codes.
- Share less personal information online.
- If service drops suddenly, call your carrier right away from another phone.
Related terms
Go deeper in Lesson 9: What hurry and secrets look like
Common questions
How do I know if I was SIM swapped?
Sudden loss of service, a SIM-change notice, or password resets you did not request.
Can a SIM swap steal from a hardware wallet?
Not directly. It targets accounts that use your phone number, like email and exchanges.
Are eSIMs safe from SIM swaps?
They remove some physical risks, but a scammer can still try to move your number. Use a carrier PIN.
What should I do first?
Call your carrier from another phone, then secure your email and exchange accounts.