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HomeBlogSkill Building & Careers
Skill Building & Careers

SIM Swap Fraud: What It Is and How to Protect Your Phone Number

SIM swap fraud lets criminals take over your phone number to reach your accounts. Learn how it works, warning signs and how to protect yourself.

The Teyro TeamOct 26, 20261 min read
On this page7 sections
  1. Direct answer
  2. Warning signs
  3. Protect yourself
  4. If it happens
  5. Where Teyro fits
  6. The bottom line
  7. More guides

Your phone number can unlock your bank, email and social accounts.

Direct answer

SIM swap fraud happens when criminals persuade your mobile provider to transfer your number to a new SIM that they control. They then receive your texts and calls, including login codes, and can access your accounts. Protect yourself with a mobile account PIN, authenticator apps and by limiting personal information online.

Warning signs

  • Sudden loss of signal on your phone.
  • Alerts about password changes or logins you did not make.
  • Provider messages about a SIM change you did not request.

Protect yourself

  1. Ask your provider about extra account security such as a PIN.
  2. Use an authenticator app or security key instead of SMS codes where possible.
  3. Do not post your phone number, birth date and address publicly.
  4. Be careful with phishing links.

If it happens

Contact your provider immediately, then your bank and email provider. Change passwords and report to authorities.

Where Teyro fits

Teyro's How Scams and Financial Fraud Work course turns this into short lessons you can play in a few minutes a day. It has 50 lessons, and you can start free.

The bottom line

Do not make your phone number the only key to your accounts.

This is general education, not personal financial advice.

More guides

  • Identity Theft
  • Social Engineering
  • 12 Red Flags of a Scam You Can Spot in Seconds
  • Identity theft basics
  • Smishing scams
  • How Scams and Financial Fraud Work course

Frequently asked questions

What is SIM swap fraud?

Criminals trick your mobile provider into moving your number to a SIM they control, so they receive your calls and texts, including security codes.

What are the warning signs?

You suddenly lose mobile signal, cannot make calls or receive unexpected notifications about changes to your accounts.

How can I protect myself?

Add a PIN or passcode to your mobile account, use an authenticator app instead of SMS codes and limit personal details online.

Learn it by playing

How Scams and Financial Fraud Work turns this into short, playable lessons. Free to start.

See the How Scams and Financial Fraud Work course

Free to start · No credit card needed

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Written by

The Teyro Team

Learning Team at Teyro

We build Teyro — an AI-powered learning platform that turns skill-building into a daily habit through bite-sized, gamified lessons. We write about the learning science and study strategies that shape our product.

More from The Teyro Team

On this page

  • Direct answer
  • Warning signs
  • Protect yourself
  • If it happens
  • Where Teyro fits
  • The bottom line
  • More guides

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