{"id":100083,"date":"2026-07-17T00:19:12","date_gmt":"2026-07-17T07:19:12","guid":{"rendered":"https:\/\/www.intego.com\/mac-security-blog\/?p=100083"},"modified":"2026-07-17T06:35:30","modified_gmt":"2026-07-17T13:35:30","slug":"how-to-protect-yourself-from-sim-swapping-attacks","status":"publish","type":"post","link":"https:\/\/www.intego.com\/mac-security-blog\/how-to-protect-yourself-from-sim-swapping-attacks\/","title":{"rendered":"How to protect yourself from SIM swapping attacks"},"content":{"rendered":"

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If someone takes over your phone number through a SIM swapping attack, they may be able to access your email, banking, social media, and other important accounts. Preventing this starts with locking down your mobile account, using stronger sign-in methods, and recognizing the warning signs early.<\/p>\n

This guide explains how SIM swapping works, how to make your accounts harder to compromise, and what to do if your phone suddenly stops receiving calls or text messages.<\/p>\n

What is SIM swapping?<\/h2>\n

SIM swapping is a type of identity theft where a scammer tricks your mobile carrier into transferring your phone number to a SIM card or eSIM they control. Once that happens, your phone number stops working on your phone, and the scammer starts receiving your calls and text messages instead.<\/p>\n

This usually starts long before the scammer contacts your mobile carrier. They first collect personal information about you through phishing emails, fake text messages, phone calls, data breaches, or even information you share publicly online. Posing as you, they then request the transfer. The U.S. Federal Trade Commission (FTC) warns<\/a> that SIM swap scams often work this way and recommends adding a PIN to your carrier account and being cautious of phishing attempts.<\/p>\n

This is dangerous because many online accounts use your phone number to verify your identity. Once scammers control your number, they can receive your security codes, reset your passwords, and sign in to your Apple Account, email, bank, social media, shopping, cryptocurrency, and other important accounts.<\/p>\n

In many cases, they don’t need to steal your iPhone or Android phone. They only need control of your phone number to get around text message-based security checks.<\/p>\n

How to prevent SIM swapping on iPhone and Android<\/h2>\n

The best way to prevent SIM swapping is to make it much harder for a scammer to convince your mobile carrier to transfer your phone number. The following steps can significantly reduce your risk.<\/p>\n

Protect your mobile carrier account<\/h3>\n

Your mobile carrier account is just as important as your email or bank account. If someone gains access to it, they may be able to request a SIM replacement, transfer your phone number, or change your account settings without ever touching your phone.<\/p>\n

One of the best ways to protect your account is to add a carrier account PIN or passcode. If someone contacts your carrier pretending to be you, the carrier can ask for this PIN before approving important changes, such as replacing your SIM card or transferring your phone number.<\/p>\n

A carrier account PIN is different from a SIM PIN. A SIM PIN only locks the SIM card or eSIM in your phone so it can’t be used in another device, while a carrier account PIN protects your account with your mobile carrier. It’s also different from an authenticator app or passkey, which protects your online accounts.<\/p>\n

Choose a PIN that’s unique and difficult to guess. Don’t use your birthday, address, “1234,” or the same PIN you use for your bank card. Also protect your online carrier account with a strong, unique password. If your carrier offers two-factor authentication for your online account, turn it on for extra protection.<\/p>\n

Finally, review your carrier account from time to time. Make sure your contact details, recovery information, and security settings are correct, and look for changes you don’t recognize. Catching suspicious activity early can stop a SIM swapping attack before it gets worse.<\/p>\n

Turn on carrier number lock or port-out protection<\/h3>\n

Enable your mobile carrier\u2019s built-in account protection to stop someone from transferring your number to another SIM card or carrier without your permission.<\/p>\n

Every carrier uses different names for these protections. You may see them called Number Lock, SIM Protection, Port-Out Protection, Account Lock, or Account Takeover Protection. The exact features and where you find them vary by carrier.<\/p>\n\n\n\n\n\n\n\n
Carrier<\/strong><\/td>\nProtection feature<\/strong><\/td>\n<\/tr>\n
Verizon<\/td>\nNumber Lock<\/td>\n<\/tr>\n
T-Mobile<\/td>\nAccount Takeover Protection<\/td>\n<\/tr>\n
AT&T<\/td>\nWireless Account Lock<\/td>\n<\/tr>\n
Google Fi<\/td>\nNumber Lock<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

If your carrier offers one of these features, turn it on as soon as you can. You can usually find it in your carrier’s app or online account. If you’re not sure where to find it, contact customer support.<\/p>\n

Use extra identity verification if your carrier offers it<\/h3>\n

Blocking phone number transfers is only one part of protecting your account. Some carriers also let you add extra identity checks before they approve sensitive account changes, such as replacing your SIM card or transferring your phone number.<\/p>\n

Depending on your carrier, this can include entering a one-time verification code, answering security questions, confirming your identity in the carrier’s app, or showing a government-issued ID in a store. These extra checks stand in the way of anyone trying to pretend to be you, even if they already know some of your personal information.<\/p>\n

If your carrier offers additional identity verification, enable it. The more ways your carrier can confirm it’s really you, the harder it is for a scammer to take over your phone number.<\/p>\n

Watch out for phishing and social engineering attempts<\/h3>\n

Many SIM swapping attacks begin with a scam designed to steal your personal information. You may receive a fake email, text message, or phone call that looks like it came from your mobile carrier, Apple, your bank, or another company you trust. The goal is to trick you into sharing passwords, verification codes, or other details a scammer can use to impersonate you.<\/p>\n

Be careful with unexpected messages asking you to click a link, download a file, or confirm personal information. If you’re unsure whether a message is genuine, contact the company using its official website, app, or customer service number instead of replying directly.<\/p>\n

Be careful with the personal information you share<\/h3>\n

Scammers don’t always need to trick you directly. They may gather information from your social media profiles, public records, or data breaches to build a picture of who you are before attempting a SIM swap.<\/p>\n

Avoid sharing personal details publicly unless they’re necessary. Be especially careful with details such as your full date of birth, home address, phone number, or answers to common security questions. Even small pieces of information can give a scammer enough to convince your mobile carrier that they’re really you.<\/p>\n

Act immediately if your phone loses service<\/h3>\n

One of the first signs of a SIM swapping attack is suddenly losing mobile service. If your phone shows “No Service<\/em>” or “SOS<\/em>” and restarting it doesn’t fix the problem, don’t ignore it. Your phone number may have been transferred to another SIM card without your permission.<\/p>\n

Contact your mobile carrier immediately and ask whether any recent changes have been made to your account. If you didn’t request a SIM replacement or phone number transfer, ask the carrier to freeze your account and restore your number. Then check your email, banking, social media, and other important accounts for suspicious activity, and change your passwords from a trusted device if you think your accounts have been compromised.<\/p>\n

Keep in mind that no single security feature can completely prevent SIM swapping. The best approach is to use several layers of protection together. These steps make it much harder for scammers to take over your phone number and access your accounts.<\/div>\n

Warning signs of a SIM swap attack<\/h2>\n

A SIM swap attack often starts with changes to your phone service before you notice problems with your online accounts. If you spot these warning signs and act quickly, you may be able to stop scammers before they take over your accounts.<\/p>\n

Watch out for these common signs:<\/p>\n