Most banks let you change your registered mobile number yourself through their app or website, but the process and what happens next depends on which bank you use and whether you're changing it for security alerts or account recovery.
When you update your phone number, you're usually changing one of two things: the number the bank uses to send you transaction alerts and security codes, or the number linked to your account for password recovery. Some banks treat these as the same field. Others keep them separate. A few banks still require you to visit a branch or call to change either one, though this is becoming less common.
The timing matters. If you're switching phones on the same day, you need to know whether your new number will work for receiving SMS codes before you log out of your old device. If you're porting your old number to a new carrier, there's a window where neither device receives texts. If you're keeping your old number but changing carriers, the bank's system may take a few hours to recognize the new carrier's network.
Key Takeaways
- Most major banks allow you to update your phone number through their mobile app or online banking portal without visiting a branch.
- The change usually takes effect when ready for alerts but may take a few hours to work for SMS-based login codes.
- If you cannot access your account because you no longer have the old phone number, contact your bank's customer service line instead of trying to log in online.
- Some banks require you to verify the new number by entering a code they text to it before the change is final.
- If you're changing your number because your old one was compromised, also change your password and review recent account activity for unauthorized transactions.
How to change your number through online banking
Log into your bank's website or app and look for a section called "Profile," "Account Settings," "Personal Information," or "Contact Details." The exact name varies by bank. Once you're there, you should see a field for your phone number — sometimes labeled "Mobile Number," sometimes "Primary Phone," sometimes "SMS Number for Alerts."
Click or tap to edit that field. Enter your new number in the format your bank expects — usually with the country code if you're moving internationally, or without it if you're staying in the same country. Some banks accept numbers with or without hyphens and spaces; others require a specific format. If the system rejects your entry, try removing all punctuation.
After you enter the new number, the bank will usually send a verification code to that number by SMS. You'll need to enter that code back into the app or website to confirm you own the number. This step protects you: it means someone who knows your password cannot change your phone number to lock you out. Once you enter the code correctly, the change is complete.
What happens if you no longer have access to your old number
If your old phone number is no longer active — because you switched carriers, lost the phone, or the number was reassigned — you cannot receive the verification code the bank sends to confirm your new number. In this case, you cannot change the number online. You will need to call your bank's customer service line instead.
When you call, have your account number, a form of ID, and answers to any security questions ready. The bank will verify your identity through these details rather than through a code sent to your phone. Once they confirm who you are, they can update your number in their system without requiring the verification code. This process usually takes a few minutes on the call, though some banks may send you a confirmation email or letter afterward.
If you're locked out of your account entirely and cannot remember your password, tell the bank that when you call. They may use your old phone number as part of their identity verification process, which means you'll need to explain why you no longer have it. Have your ID ready and be prepared to answer additional security questions.
Timing: when the new number starts working
The change itself is usually when ready. Once you enter the verification code, your new number is in the bank's system. However, the systems that use that number do not all update at the same moment.
Transaction alerts and fraud notifications typically start going to your new number within minutes. If you check your account settings right after the change, you'll see the new number listed.
SMS-based login codes — the ones you receive when you try to log in from a new device or browser — may take a few hours to route to your new number. If you try to log in within an hour of changing your number and the code does not arrive, wait a few hours and try again. If it still does not arrive after 24 hours, contact the bank.
If you're switching to a new phone on the same day, complete the number change on your old phone before you lose access to it. That way, your new phone will receive codes and alerts as soon as it's active on the new carrier.
Changing your number for security reasons
If you changed your phone number because your old one was compromised — someone else has access to it, or you suspect they do — tell your bank when you update the number. Some banks flag accounts that have been compromised and review recent transactions automatically. Others wait for you to report it.
After you change your number, also change your online banking password. Use a password you have never used before, make it at least 12 characters long, and do not reuse it on other websites. If you use the same password on multiple sites, change those too.
Review your recent transactions for anything you did not authorize. Most banks let you do this in the "Transaction History" or "Account Activity" section of their app. If you see unauthorized charges, report them to the bank when ready. Most banks have a fraud reporting number separate from general customer service; check your bank statement or the back of your card for it.
Banks that still require a branch visit or phone call
Most major banks now allow online updates, but some smaller banks, credit unions, and online-only banks have different policies. A few require you to call a customer service number. Others require a branch visit if you're changing the number for the first time or if you're changing it to a number in a different country.
If you try to change your number online and the system will not let you, or if you do not see a way to do it in your app, call your bank's customer service line. They can tell you whether the change can be done over the phone or whether you need to visit a branch. Most banks can handle it over the phone in a few minutes.
What to do if the verification code does not arrive
If you entered your new number correctly but the verification code never arrives, first check that you entered the number in the right format. Some banks require a country code even for domestic numbers; others do not. If you're unsure, try entering it with and without the country code.
If the format is correct and the code still does not arrive after five minutes, wait another five minutes. SMS delivery can be delayed, especially if you just switched carriers or if the new carrier's network is congested. If it has been 15 minutes and the code still has not arrived, close the app or browser and start the process again. Sometimes the system will send a new code.
If you've tried twice and the code is not arriving, contact your bank's customer service line. They can verify your identity and update the number without requiring the code. This is faster than waiting for SMS delivery to work.
Frequently Asked Questions
Will changing my phone number affect my mobile banking app?
No. The app itself is tied to your account login, not to your phone number. You can log into the app on your new phone with your username and password. The phone number change only affects how the bank contacts you and which number receives login codes.
Can someone change my phone number if they know my password?
Not if your bank requires verification. When you change your number online, the bank sends a code to the new number you entered. The person changing the number has to enter that code to complete the change. If they do not have access to the new number, they cannot finish the process. This is why the verification step exists.
What if I'm traveling and my phone does not work in the country I'm visiting?
If you have a local number in the country you're visiting, you can change your registered number to that one before you travel. If you do not, contact your bank before you leave and ask whether they can temporarily disable SMS-based login codes so you can access your account through other methods, like security questions or a PIN. Some banks allow this; others do not.
How long does it take for my bank to recognize a new carrier?
Usually a few hours, sometimes up to 24 hours. When you port your number to a new carrier, the carrier's network takes time to propagate through the SMS routing system. Your bank's system will eventually recognize the new carrier, but there may be a delay. If you cannot receive codes after 24 hours, call your bank to confirm the number is correct in their system.
Do I need to update my phone number if I'm just getting a new phone with the same number?
No. If you're keeping the same phone number and just switching to a new device, you do not need to change anything in your bank account. The number is the same, so the bank's system will work exactly as before. You just log into your app on the new phone with your username and password.