Security glossary
What is SIM swapping?
SIM swapping is when attackers convince a telecom provider to move your number to their SIM card.
Last reviewed: 2026-05-23
In plain English
Once attackers control your number, they can intercept SMS codes and reset accounts.
Telecom breaches increase risk because exposed identity details help social-engineering attempts.
SIM swapping is especially dangerous when SMS is used for account recovery.
Real-world example
Your phone loses signal suddenly, then your email and financial account passwords are reset.
What you should do
- Set a telecom account PIN and extra verification controls.
- Move high-risk logins from SMS MFA to authenticator apps where possible.
- React fast to unexplained signal loss or port-out notifications.
Related terms
What is multi-factor authentication (MFA)?
MFA adds a second login check after your password, like an app code or hardware key.
What is account takeover?
Account takeover (ATO) is when someone gains control of your account and can change settings, spend money, or lock you out.
What is smishing (SMS phishing)?
Smishing is phishing through text messages, usually using fake delivery, banking, or refund alerts.