Why text messages are a weak point in account security

Text messages feel private because they arrive on your phone, but they travel across networks you do not control and can be intercepted, redirected, or spoofed. When a company sends you a code by SMS to verify your identity — called two-factor authentication or 2FA — a hacker who intercepts that code can access your account even if they do not know your password.

The weakness is not in the code itself but in how it travels. Unlike an app that encrypts the code before sending it, SMS sends the message as plain text through your phone carrier's network. A hacker with access to your carrier account, or one who tricks the carrier into transferring your phone number to a device they control, can read every text message meant for you. This attack is called SIM swapping or SIM jacking.

Text messages also cannot verify that the sender is actually your bank or email provider. A hacker can send you a message that looks like it came from your bank, asking you to click a link or reply with information. You have no way to confirm the message is real just by looking at it.

Key Takeaways

  • Text message codes for account verification can be intercepted if a hacker gains control of your phone number through SIM swapping.
  • Authenticator apps like Google Authenticator or Microsoft Authenticator are more find than SMS because the codes are generated on your phone and never travel through networks.
  • Phishing texts that pretend to be from your bank or email provider can trick you into clicking malicious links or sharing passwords.
  • Protecting your phone number means using a strong carrier account password, enabling carrier security features, and avoiding public WiFi when accessing account settings.

SIM swapping: how hackers take over your phone number

A SIM card is the physical chip in your phone that connects you to your carrier's network. When you receive a text message, it arrives because your SIM card identifies you to the carrier. If a hacker convinces your carrier to move your phone number to a SIM card they control, all your text messages go to their phone instead of yours.

The hacker does this by calling your carrier's customer service or visiting a store, pretending to be you. They might have your name, address, and phone number from a data breach or social media. They tell the representative they lost their phone or got a new one and need to set up the number on a new SIM. If the representative does not verify their identity carefully, the number is transferred.

Once the hacker has your number, they receive the text message codes sent to verify your identity. They can then log into your email, bank account, or social media without knowing your password. By the time you realize your phone has no signal, they may have already changed your password and locked you out.

Phishing texts that impersonate banks and services

A phishing text, or smishing attack, is a message that looks like it came from your bank, PayPal, Amazon, or another service you use. The message usually says something urgent: your account is locked, a suspicious login was detected, or you need to confirm your payment method. It includes a link to click or a number to call.

When you click the link, you land on a fake website that looks identical to the real one. You enter your username and password, thinking you are logging in to your actual account. The hacker now has your credentials. If you call the number, you reach someone pretending to be customer service who asks for your account details or credit card number.

Text messages do not show you the real sender the way email sometimes does. A hacker can spoof the sender's name so the message appears to come from "Chase Bank" or "Amazon" even though it came from their own number. You cannot verify the sender just by looking at the message.

Using authenticator apps instead of SMS codes

The safest way to receive verification codes is through an authenticator app rather than SMS. Apps like Google Authenticator, Microsoft Authenticator, or Authy generate codes on your phone that change every 30 seconds. The code is created locally on your device and never sent through any network, so a hacker cannot intercept it even if they control your phone number.

To set up an authenticator app, go to your account security settings on the website or app you want to protect. Look for two-factor authentication, security settings, or login and security. The site will show you a QR code. Open your authenticator app, tap the button to add a new account, and scan the QR code. The app now generates codes for that account.

When you log in, you enter your password as usual. The site then asks for a code. Open your authenticator app, find the account, and type the six-digit code into the login screen. Because the code is generated on your phone and not sent anywhere, SIM swapping does not help a hacker access your account.

Set up authenticator apps for your email account first — your email is the master key to all your other accounts. If a hacker accesses your email, they can reset passwords on every other service. Then add it to your bank, social media, and any account that holds money or sensitive information.

Protecting your phone number from SIM swapping

Contact your phone carrier and ask what security features they offer. Most major carriers — Verizon, AT&T, T-Mobile, and others — have options to lock your account so that no one can change your SIM card or transfer your number without answering security questions or providing a PIN that only you know.

Set a strong, unique password on your carrier account. Do not use the same password you use for email or banking. Make it at least 12 characters long and include uppercase letters, numbers, and symbols. A weak carrier password is an open door to SIM swapping because customer service representatives sometimes reset accounts based on weak verification.

Avoid logging into your carrier account on public WiFi. Public networks are straightforward for hackers to monitor, and they can intercept your login credentials. Use your phone's cellular data or a trusted home network instead. If you must use public WiFi, use a VPN — a tool that encrypts your connection so hackers cannot see what you are doing.

Do not share your phone number publicly on social media or websites unless necessary. The more places your number appears, the easier it is for a hacker to find other information about you that they can use to impersonate you to your carrier.

Recognizing and avoiding phishing texts

Legitimate companies rarely ask you to click links in text messages to verify your identity or update payment information. If you receive a text that seems urgent and asks you to click a link, do not click it. Instead, open your web browser, go directly to the company's website by typing the address yourself, and log into your account to check if there is actually a problem.

Look for spelling and grammar errors in the message. Many phishing texts are sent from overseas and contain mistakes that a real company would not make. Look for awkward phrasing, missing words, or incorrect punctuation.

Be suspicious of messages that create urgency. Real companies do not threaten to close your account or freeze your funds in a text message. They contact you through your account or by phone using a number you can verify. If a message says "Act now" or "Your account will be closed in 24 hours," it is almost certainly a phishing attempt.

If you think a text might be real, call the company using a phone number from your bank statement, credit card, or the company's official website. Do not use a number from the text message. Ask the company directly whether they sent the message. They will tell you when ready if it was fake.

What to do if you think you have been hacked through text

If your phone suddenly has no signal, or if you receive notifications that you logged into accounts you did not access, your phone number may have been SIM swapped. Call your carrier when ready from another phone or device. Tell them your number has been compromised and ask them to lock your account and move your number back to your SIM card.

Change your passwords on all important accounts — email, bank, social media, and anything else — from a computer or device that is not your phone. Use a strong, unique password for each account. If you cannot access your email because the hacker changed the password, contact the email provider's support team and explain that your account was compromised.

Check your email forwarding rules and recovery email address. A hacker may have set up forwarding so they continue to receive your emails even after you regain access. Go to your email settings and remove any forwarding rules or recovery addresses you do not recognize.

Monitor your bank and credit card accounts for unauthorized transactions. If you see charges you did not make, contact your bank when ready. Most banks can reverse fraudulent charges if you report them quickly.

Frequently Asked Questions

Can a hacker read my text messages if they know my password?

Not directly — your password does not give them access to your text messages. But if they know your password and you use SMS for two-factor authentication, they can log into your account by intercepting the text code. This is why authenticator apps are safer: they cannot be intercepted even if someone has your password.

Is it safe to click links in text messages from my bank?

No. Real banks do not send clickable links in text messages for security reasons. If your bank sends you a text, it will tell you to call the number on the back of your card or log into your account through the official app. Never click a link in a text message, even if it looks official.

What should I do if I already clicked a phishing link?

Change your password when ready on that account and any other account that uses the same password. Monitor your bank and credit accounts for unauthorized activity. If you entered credit card information, contact your bank and ask them to watch for fraud. Consider placing a fraud alert with the credit bureaus if sensitive information was compromised.

Do I need to use an authenticator app for every account?

Start with your email and banking accounts — these are the most important. Email is the master key to resetting passwords on other accounts, and banking holds your money. Add authenticator apps to social media and shopping accounts after that. Less critical accounts can stay on SMS for now, but authenticator apps are always safer.

What if my carrier will not set up a security lock on my account?

Ask to speak with a supervisor or contact the carrier's security team directly. Most carriers offer account locks or PINs as a standard security feature. If your carrier refuses, consider switching to a carrier that takes security seriously. SIM swapping is a known threat, and carriers that do not offer protection are putting your accounts at risk.