Your Mobile Number Can Be Stolen — How SIM Swap Scams Work in Australia

A SIM swap scam is one of the most dangerous forms of identity theft because the victim often doesn't realise anything is wrong until accounts start being accessed or money disappears.

Unlike traditional phishing scams, criminals don't always need your banking password first. Sometimes all they need is enough personal information to convince a telecommunications provider that they are you.

A SIM swap scam occurs when a criminal convinces a telecommunications provider to move your phone number onto a SIM card they control.

Once successful, calls and SMS messages intended for you are redirected to the scammer's device.

This becomes especially dangerous because many online services use SMS verification codes as a security measure.

Your phone number has become one of the most important pieces of digital identity you own.

Many organisations use SMS codes to confirm account ownership. If a criminal controls your number, they may receive those codes instead of you.

This can potentially allow them to:

• Reset online banking passwords.
• Access email accounts.
• Take control of social media profiles.
• Bypass multi-factor authentication.
• Access cryptocurrency exchanges.
• Intercept verification codes.

Most SIM swap attacks start with information gathering.

Criminals may collect personal information through phishing emails, data breaches, fake customer support calls, social media profiles or impersonation scams.

They often combine small pieces of information until they can convincingly pretend to be the victim.

One of the biggest problems with SIM swap scams is that victims often notice the signs too late.

• Your phone suddenly shows "No Service".
• You stop receiving calls or SMS messages.
• Bank verification messages never arrive.
• You receive alerts about password changes you didn't request.
• Friends report strange messages from your accounts.
• Unexpected login notifications appear.

If your phone unexpectedly loses service and restarting the device does not help, contact your mobile provider immediately.

The faster you act, the greater your chances of stopping account takeover attempts before significant damage occurs.

No security measure is perfect, but several simple habits can significantly reduce risk.

• Be cautious about sharing personal information online.
• Use strong, unique passwords.
• Enable multi-factor authentication.
• Use authentication apps instead of SMS where available.
• Treat unexpected calls claiming to be from your provider with caution.
• Regularly review account security settings.

Phone numbers have become digital keys. As more services rely on SMS verification, criminals increasingly see mobile numbers as valuable targets.

A successful SIM swap can potentially unlock multiple accounts, making it one of the most profitable forms of identity fraud.

Many SIM swap scams begin with phishing messages, impersonation attempts and social engineering designed to collect personal information.

OziShield helps identify high-risk indicators in suspicious messages, links and scam patterns before personal information is shared.

The goal is simple: help Australians make clearer trust decisions before scammers obtain the information they need.

This article provides general scam awareness information for Australians. If you believe your mobile number has been compromised, contact your telecommunications provider immediately.