📱 Trading Standards Warning: Rapidly Spreading 'Sim Swap' Scam Targets UK Mobile Users

Friday, 14 August 2026

Trading Standards have issued a warning over a rapidly spreading 'SIM swap' telephone scam that is sweeping the UK. It is one of the most dangerous scams around because it doesn't just steal your money — it steals your phone number first, and uses it to empty your bank accounts while the alerts go to the fraudster instead of you.

What is SIM swap fraud?

Your phone number is tied to a small plastic card in your phone called a SIM card. Your bank and other services use your number to send you one-time security codes — the ones you type in to approve a payment or log in.

In a SIM swap attack, fraudsters trick your mobile network into moving your number onto a SIM card they control. The moment that happens:

  • Your phone goes dead (no signal, no calls, no texts).
  • The fraudster receives all your calls and texts.
  • They use your number to reset your banking passwords and approve transfers.
  • They can drain your accounts before you even realise your phone stopped working.

This is called SIM swapping (or SIM hijacking). It is not a hack of your phone — it's a takeover of your phone number itself.

How do they do it?

Fraudsters usually build the scam in two stages:

  1. They gather your details first. Through phishing texts, fake calls, data breaches, or social media, they collect your name, address, date of birth, and mobile number. You may have handed this over without realising — for example, to a fake "delivery" or "bank security" call.
  2. They impersonate you to your mobile provider. They contact your network pretending to be you, claiming they've lost their phone or SIM, and ask for a replacement SIM to be activated. If they pass the security checks — sometimes with stolen details, sometimes by manipulating staff — your number is moved to their SIM.

Some fraudsters also target people who reuse passwords, breaking into online accounts to find the personal details they need.

Why this warning matters

Trading Standards are flagging this as rapidly spreading — and it is especially dangerous because of how quietly it happens. There is no suspicious link to click and no obvious "phishing email". Your phone just stops working, and by the time you investigate, money may already be gone.

This scam hits families hard: joint accounts, savings, and overdrafts can all be cleaned out, and fraudsters often target people who have recently shared details online or fallen for an earlier phishing attempt.

The simple checks that stop SIM swap fraud

  • If your phone suddenly loses signal and stays dead, do NOT assume it's a network fault. Contact your mobile provider immediately from another phone and ask if a SIM swap or number transfer was requested.
  • Never share one-time codes — not with anyone, for any reason. No bank, no network, no "security team" will ever ask for a code you didn't request.
  • Set up a separate PIN or password on your mobile account that the network asks for before any SIM or account change. Ask your provider about "SIM lock" or account security options.
  • Use an authenticator app instead of SMS codes for your most important accounts (email, banking, social media) where possible — app-based codes can't be stolen by a SIM swap.
  • Don't reuse passwords. Use a different strong password for your email and banking, and turn on two-factor authentication (2FA).
  • Be suspicious of calls or texts asking you to "confirm" personal details. Your bank and provider already have them. Hang up and call back on the official number.
  • Check your online accounts for unexpected activity — a fraudster often tests access before the full attack.

What to do if you think you've been SIM swapped

  • Contact your mobile provider immediately and tell them your SIM may have been swapped without your permission. They can block the new SIM and restore your number.
  • Call your bank right away on the number on the back of your card. Ask them to freeze your accounts and check for recent transfers.
  • Change your passwords for email, banking, and other important accounts — but only once you're back on your own connection and your number is restored.
  • Report the scam to Action Fraud on 0300 123 2040 or at actionfraud.police.uk.
  • Keep evidence: the time your phone went dead, any texts or calls you received, and your provider's records of the swap.

Share this warning

SIM swap fraud is one of the fastest-growing phone scams in the UK, and most people have never heard of it. Share this with your parents, your partner, and your friends — knowing the signs could be the difference between a dead phone and an empty bank account.

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— CyberAware UK · 🐾 GUARDED BY BULLY — DIGITAL THREAT RESPONSE UNIT