SIM-swap scams

What is it?

A SIM swap is when a scammer convinces your mobile network to move your phone number onto a SIM card they control, usually by pretending to be you.

How does it work?

Scammers often gather personal details first (from leaks, social media, or phishing), then contact your provider claiming your SIM is lost or damaged. Once the swap goes through, they receive your calls and SMS one-time codes — which can unlock banking and other accounts.

How do I recognise it?

• Your phone suddenly loses signal with no explanation.
• You stop receiving calls or SMS, including one-time codes.
• You receive an SMS confirming a SIM swap or number port that you didn't request.

What should I do?

• Contact your mobile provider immediately, from another phone, to check and reverse any swap.
• Check your bank account and linked accounts for unauthorised activity.
• Move away from SMS-based one-time codes toward an authenticator app where the service allows it.

What should I avoid?

• Don't wait to see if signal returns before contacting your provider.
• Don't share personal details like your ID number over unsolicited calls or messages.

Where can I get help?

• Your mobile provider's fraud or security department.
• Your bank's fraud line.
• The South African Police Service, for a case number.