July 22, 2026
SIM Swap Attacks: How They Work and How to Protect Yourself
What a SIM swap actually is
A SIM swap happens when someone convinces your carrier — or an insider — to move your phone number onto a SIM card they control. From that point on, they receive your calls and texts, including any two-factor authentication codes sent by SMS.
Why it's especially dangerous after a phone theft
If your phone is stolen, a thief with physical access to the SIM has an easier path to swap it, or to use the SIM directly in another device to intercept codes while you're still trying to figure out what happened.
How to protect yourself before it happens
Move two-factor authentication off SMS wherever possible, using an authenticator app or hardware key instead. Add a PIN or passcode to your carrier account specifically to prevent SIM changes without it.
How to catch it fast if it does happen
The clearest sign is your phone suddenly losing signal or showing 'No Service' with no clear cause. If you're monitoring for it, a mismatch between the SIM your device last used and the one it's using now is a reliable, immediate signal — worth having something watch for automatically rather than noticing only once accounts start getting locked.
This isn't a rare, theoretical attack
The FBI's Internet Crime Complaint Center logged nearly 1,000 SIM-swapping complaints in the US in 2024 alone, totaling upwards of $25 million in reported losses — and that's likely an undercount, since many victims never realize a SIM swap was the actual entry point. UK fraud-prevention service Cifas reported unauthorized SIM swaps there jumped more than tenfold year-over-year in 2024. SIM-swap alerts are included on DevTrac's Pro and Family plans — worth checking your current plan covers it if this is the risk you're most worried about.
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