SIM Swapping Attacks: Protect Your Online Accounts

The Growing Threat to Your Phone Number in 2025

As we move further into 2025, cell phone numbers have become essential identifiers. They are utilized for registration on numerous websites and online platforms, encompassing retail, banking, social networking, and healthcare services.

Your phone number serves as a key for password recovery and facilitates secure account access through two-factor authentication codes.

However, the compromise of your phone number can effectively grant an attacker access to your digital life.

A stolen phone number enables hackers to gain access to your online accounts and potentially deceive customer service systems into believing they are you.

In some instances, a compromised phone number can even provide unauthorized access to a company’s network, exposing sensitive data and files.

This underscores the importance of proactively safeguarding your phone number against SIM swapping, a cyberattack involving the hijacking of a victim’s phone number.

Fortunately, securing your number is now more straightforward than ever.

How SIM Swapping Works

SIM swapping attacks typically begin with a malicious actor contacting a cellular carrier, fraudulently posing as the legitimate customer.

The hacker leverages publicly available information, such as the customer’s name and birthdate, to convince a customer support representative to transfer the number to a different SIM card or carrier.

Upon completion of this process, the victim’s phone number becomes active on a SIM card controlled by the attacker, allowing them to make calls and send/receive texts as if they were the original owner.

Often, the initial indication of a SIM swap is the sudden and unexplained loss of cellular service.

These attacks exploit vulnerabilities in cellular providers’ security protocols, specifically those governing account modifications by customer support representatives without explicit customer verification.

Carrier Responses to SIM Swapping

To counter these social engineering tactics, major US carriers – AT&T, T-Mobile, and Verizon – have implemented enhanced security features designed to impede fraudulent account alterations, such as unauthorized number porting.

It is advisable to review your phone carrier’s account settings, as these features are often not prominently advertised and may require manual activation.

AT&T

AT&T introduced its free Wireless Account Lock feature in July to help prevent SIM swap attacks.

This feature allows customers to add an extra layer of account protection by enabling a setting that prevents unauthorized SIM card or number transfers.

The setting can be toggled within the AT&T app or online account portal, but ensure your account itself is secured with a strong, unique password and multi-factor authentication.

T-Mobile

T-Mobile provides customers with the ability to prevent SIM swaps and block unauthorized number port outs at no cost through their online account.

The primary account holder must log in to modify these settings.

Verizon

Verizon offers two security features – SIM Protection and Number Lock – designed to prevent SIM swaps and phone number transfers, respectively.

Both features can be activated via the Verizon app or online account portal by an account owner or manager.

Verizon notes that disabling these features may introduce a 15-minute delay before any account changes can be processed, providing an additional safeguard for legitimate account holders.