Quick answerSIM swap fraud is when a criminal gets a replacement SIM for your number so they receive your OTPs and can reset your bank, wallet and WhatsApp accounts. If your phone unexpectedly loses service, call your operator from another phone, ask them to block the new SIM, and alert your bank. Reduce the risk by using authenticator apps instead of SMS codes where possible.

Your phone number is the key to most accounts: banks, wallets, WhatsApp and email all send codes to it. In a SIM swap, a criminal convinces or bribes someone to issue a new SIM for your number, often using a forged or stolen ID copy. Your SIM goes dead and theirs starts receiving your messages.

Warning signs

  • Your phone shows "No service" or "Emergency calls only" in an area where it normally works.
  • You get a message about a SIM replacement or change you didn't request.
  • You suddenly can't log into WhatsApp, or get "your number was registered on another device".
  • Bank or wallet alerts stop arriving, or you get password-reset emails you didn't request.

If it happens

  1. From another phone, call your mobile operator's helpline and report an unauthorised SIM replacement. Ask them to block it.
  2. Call your bank and wallet helplines and ask them to freeze transactions and logins.
  3. Change your email password from a trusted device and check its recovery phone number.
  4. Recover WhatsApp once your SIM works again (see our WhatsApp recovery guide).
  5. File a cyber crime complaint and keep the reference.

How to protect your number

  • Use an authenticator app (Google Authenticator, Microsoft Authenticator, Aegis) instead of SMS for important accounts where possible.
  • Don't share copies of your CNIC or ID on social media or with unverified agents.
  • Check how many SIMs are registered to your CNIC through your telecom regulator's official service and block any you don't recognise.
  • Turn on a PIN for your WhatsApp (two-step verification) so a hijacked number alone isn't enough.

Frequently asked questions

How do I know if my SIM has been swapped?

Sudden loss of signal, a message about a SIM change you didn't request, or being logged out of WhatsApp are the main signs. Call your operator from another phone straight away.

Can SIM swap be prevented?

You can make it much harder by protecting your ID copies, using authenticator apps instead of SMS codes, and setting a WhatsApp two-step PIN.

Related guides

Two-factor authentication: which type to use and how to turn it on"This is your bank calling": how the OTP scam works and how to shut it downYour WhatsApp got hijacked. Here's the exact recovery order.