Yes, but only if they also have other information or access

Your phone number alone is not enough to drain your bank account. A hacker needs either your password, access to your phone itself, or enough personal details to reset your password or convince your bank they are you. That said, your phone number is the entry point for several real attacks, and it is worth understanding which ones work and how to stop them.

The most common attack is SIM swapping: a hacker calls your mobile carrier, convinces them they are you, and transfers your phone number to a new SIM card in the hacker's phone. Once they control your number, they can receive the text codes your bank sends when you try to log in or reset your password. If your bank uses text messages as your only second factor, they are in. This works because carriers sometimes verify identity using information that is public or easily guessed—your name, address, last four digits of your Social Security number, or answers to security questions.

A second route is phishing: the hacker texts or calls you pretending to be your bank, asks you to "verify" your account, and you hand over your login details or one-time codes. They then log in while you are still on the call or shortly after. Your phone number made you reachable, but your response made the attack work.

The third is password reset interception. If your bank sends password reset links by text, and a hacker has your email address and phone number, they can request a reset on your behalf. The link arrives on your phone—but if you do not notice, or if the hacker is fast, they may be able to set a new password before you do.

Key Takeaways

  • A phone number is not a password; a hacker needs additional information or access to your phone to break in, but your number is often the weakest link in the chain.
  • SIM swapping—where a hacker transfers your number to their phone—is the most direct attack, and it works because mobile carriers sometimes verify identity using public information.
  • Text message codes are better than nothing, but they are not secure if a hacker controls your phone number; use an authenticator app instead if your bank offers it.
  • Do not give out your phone number to unknown callers claiming to be from your bank, and do not click links in unsolicited texts asking you to log in or verify your account.
  • If you suspect your phone number has been compromised, contact your bank and mobile carrier immediately to lock your accounts and prevent SIM swaps.

How SIM swapping works and why carriers let it happen

When you port your phone number to a new phone or carrier, the process is called a SIM swap. A hacker calls your mobile carrier's customer service line, claims they lost their phone, and asks to move the number to a new SIM card. If the carrier's verification process is weak—asking only for your name, address, and the last four digits of your Social Security number—the hacker can pass. Within minutes, your number is active on their phone, and your old phone loses service.

Once the hacker has your number, they can request password resets from your bank, email, and other accounts. The reset link or code arrives on their phone, not yours. They set a new password and lock you out. If your bank uses text codes as your only second factor, they can now log in and transfer money.

Major carriers have tightened verification in recent years, but the process still varies by location, by which customer service representative you reach, and by whether you have set up extra protections. Some carriers offer a port freeze or port lock—a flag on your account that prevents anyone from moving your number without an in-person visit to a store or a call from a verified phone number on file. This is free and takes minutes to set up. If you have not done it, do it now.

Text message codes are convenient but not secure

Banks and other services send one-time codes by text because it is cheap and most people have a phone. But text messages are not encrypted, and they travel over networks that hackers can sometimes intercept. More importantly, if a hacker controls your phone number via SIM swap, they receive the codes before you do.

A time-based one-time password (TOTP) app—such as Google Authenticator, Microsoft Authenticator, or Authy—is more secure. These apps generate codes on your phone that change every 30 seconds. They do not rely on text messages or your phone number. Even if a hacker has your number, they cannot get the codes unless they have your phone or the backup key you set up when you first installed the app.

Check whether your bank offers an authenticator app as a second factor option. If it does, set it up and remove text message codes as your backup. If your bank does not offer it yet, ask them to add it. In the meantime, text codes are better than no second factor, but they are not the strongest option available.

Phishing attacks that arrive by text or call

A hacker texts you a link claiming to be from your bank: "Unusual activity detected. Verify your account here." The link looks real, the message sounds urgent, and you click. You land on a fake login page that looks identical to your bank's real site. You enter your username and password. The hacker now has them.

Alternatively, the hacker calls you, says they are from your bank's fraud team, and tells you that someone tried to access your account. They ask you to confirm your password or read back the one-time code that just arrived on your phone. You comply, thinking you are protecting yourself. You have just handed them the keys.

Your bank will never ask you to confirm your password over the phone or by text. If you receive an unsolicited message asking you to log in or verify your account, do not click the link and do not call the number in the message. Instead, hang up or ignore it, then call your bank using the number on your debit card or statement. Tell them what you received. They can tell you whether the message was real.

What to do if you think your phone number has been compromised

If your phone suddenly loses service, or if you receive alerts from your bank about login attempts you did not make, act immediately. First, call your mobile carrier from a different phone—a friend's phone, a landline, or a payphone. Tell them your number may have been SIM swapped and ask them to lock your account so no one can port your number without an in-person visit. Ask them to confirm which SIM card your number is currently on.

Second, call your bank from the number on your debit card or statement. Tell them you suspect your phone number has been compromised and ask them to review your account for unauthorized transactions. Ask them to temporarily disable any password resets by text and to require you to call a specific number to make changes. Some banks can add a verbal password or PIN that you must provide over the phone before any account changes are made.

Third, change your passwords for email, banking, and any other sensitive accounts—but do this from a computer, not from your phone, and only after you have confirmed your phone number is secure. If a hacker still has your number, they can intercept password reset codes while you are trying to change them.

Fourth, monitor your credit reports for signs of identity theft. You can check your reports for free at annualcreditreport.com, which is run by the three major credit bureaus. If you see accounts you did not open, file a report with the Federal Trade Commission at reportidentitytheft.ftc.gov.

Steps to protect your phone number from being hijacked

Set up a port lock or port freeze with your mobile carrier. This is the single most effective defense against SIM swapping. Call your carrier's customer service line and ask for it by name. Some carriers call it a "port freeze", others call it a "port lock" or "account lock". The process is free and usually takes one phone call. You may need to provide a PIN that only you know, which the carrier will ask for before allowing any port requests in the future.

Do not share your phone number on public websites, social media, or with businesses that do not need it. The more places your number appears, the easier it is for a hacker to find it and use it to reset passwords or convince a carrier they are you. When a website asks for your phone number, ask whether it is required or optional. If optional, skip it.

Use strong, unique passwords for your email and bank accounts. If a hacker gets your password through phishing or a data breach, they still cannot log in if your password is long and random. Use a password manager like Bitwarden, 1Password, or KeePass to generate and store passwords so you do not have to remember them.

Enable an authenticator app as your second factor if your bank offers it. If your bank does not offer it yet, ask them to add it. In the meantime, text message codes are better than nothing, but they are not secure against SIM swapping.

What your bank can do to protect you

Banks can reduce the risk of account takeover by not relying on text message codes as the only second factor. They can require an authenticator app, a hardware security key, or a call to a verified phone number before allowing password resets or large transfers. Some banks now offer push notifications instead of text codes: when you try to log in, your bank's app sends a notification to your phone asking you to approve or deny the login. This is more secure than text codes because it happens on your phone, not on a number that can be ported.

Banks can also verify your identity more carefully before allowing password resets. Instead of asking for your name and address, they can ask questions about your account history—which credit card you opened first, which branch you visited most recently, or which transactions you made on a specific date. This information is harder for a hacker to guess.

If your bank still relies only on text message codes, or if they do not offer an authenticator app, contact them and ask them to add stronger options. Banks respond to customer demand, and the more people who ask, the faster they will move.

Frequently Asked Questions

Can someone access my bank account if they have my phone number and email address?

Not immediately, but they have two of the three pieces they need. If they also have or can guess your password, or if they can convince your bank they are you, they can reset your password and lock you out. This is why a strong, unique password and a port lock on your phone number are both important.

What should I do if I get a text from my bank asking me to verify my account?

Do not click any links in the text. Call your bank using the number on your debit card or statement and ask whether they sent it. If they did not, report the text as phishing to your bank and to your mobile carrier. If they did send it, they will tell you what to do next.

Is an authenticator app really more secure than text message codes?

Yes. Text codes travel over networks and can be intercepted or redirected if a hacker controls your phone number. Authenticator apps generate codes on your phone that do not rely on text messages or your phone number. Even if a hacker has your number, they cannot get the codes unless they have your phone.

Can I get my money back if a hacker drains my account?

It depends on how quickly you report it and what type of transaction occurred. If you report unauthorized charges within two business days, federal law limits your liability to $50. If you wait longer, your liability can be higher. Contact your bank immediately if you see unauthorized transactions, and ask them what protections apply to your account.

Do I need to change my phone number if it has been compromised?

Not necessarily. A port lock prevents someone from moving your number to another phone, which stops the most direct attack. If you have already set up a port lock and changed your passwords, you can keep your number. If you did not have a port lock and a hacker had access for a long time, changing your number may be safer, but it is not always required.