How to Change a Bank Account Phone Number Through the Proper Channel

If the phone number linked to your bank account is lost, inactive, stolen or no longer belongs to you, update it as soon as possible. Your bank may use that number for transaction alerts, one-time passwords, account recovery and other security checks.

The correct process depends on your bank and the type of change you need to make. Some banks allow customers to update their details through an official mobile app or internet banking. Others may require a visit to a branch, especially when the old number is unavailable or additional identity checks are needed.

Do not give your PIN, password, OTP, card details or mobile-banking login to anyone claiming to help you change the number. Use only the bank’s official channels.

First, understand which phone number you want to change

People sometimes use the phrase “bank account phone number” to describe different numbers. Identifying the correct one can make the process easier.

• Alert or notification number: the number that receives debit and credit alerts.
• Transaction-authorisation number: the number used to receive OTPs or other approval messages.
• Mobile-banking profile number: the number connected to the bank’s app or internet-banking profile.
• Contact number on your customer record: the phone number held in the bank’s account information.

In many cases, these details are connected. However, a bank may require a separate update or verification for one or more of them. Ask the bank to confirm that the new number has been updated across the relevant services.

Prepare before you contact the bank

Have the information needed to identify your account ready, but do not send it through an unofficial channel. Depending on the bank and the reason for the change, you may be asked for some of the following:

• Your full name as registered on the account.
• Your account number.
• A valid means of identification.
• Your date of birth or other account-verification details.
• The old phone number, if you still remember or control it.
• The new phone number you want to register.
• A completed customer-information or account-maintenance form, where required.

If your SIM card was lost or stolen, contact your mobile network provider quickly to block or replace it. Also notify your bank if you believe someone may have access to your account alerts, OTPs or banking profile.

Option 1: Use the bank’s official mobile app or internet banking

Some banks provide a profile, personal-information or account-maintenance section in their official app or online banking platform. The exact menu names differ, so do not rely on instructions written for another bank.

1. Open the bank’s official app or type the bank’s official website address into your browser.
2. Sign in using your normal credentials. Avoid logging in through links sent by strangers or unexpected messages.
3. Look for sections such as Profile, Personal Information, Settings or Account Maintenance.
4. Select the option for updating your phone number if it is available.
5. Enter the new number carefully and review it before submitting.
6. Complete the bank’s approved verification process.
7. Save the confirmation message or reference number without sharing it publicly.

The app may require an OTP sent to your existing number. If you no longer have access to that number, the self-service option may not work. Do not try to bypass the security step with help from an unknown person. Use the bank’s official customer-care or branch process instead.

Option 2: Visit a bank branch

A branch visit is often the most practical route when the old number is unavailable, the account has been restricted, your app details are incorrect or the bank requires face-to-face verification.

Take a valid identification document and any other item the bank officially requests. You may also need your account number and the new phone number. At the branch, explain clearly that you want to update the phone number linked to your account.

Before leaving, ask the staff to confirm:

• Whether the new number has been entered correctly.
• When the change will take effect.
• Whether transaction alerts and OTP services are both connected to the new number.
• Whether you must reactivate mobile banking or reset any service.
• How you will know that the request has been completed.

Use a branch listed on the bank’s official website or official customer-care channels. Be cautious if someone outside the branch offers to process the update for a fee or asks you to disclose confidential banking information.

Option 3: Contact official customer care

Customer care can explain the bank’s requirements and tell you whether the change can be completed remotely. Use the phone number, email address, live-chat feature or social-media account published by the bank itself.

During the call, the bank may ask questions to confirm that you are the account holder. This is different from requesting your secret security information. A legitimate representative should not need your full PIN, password, OTP or card PIN to “help” you update your phone number.

If customer care cannot complete the change over the phone, ask for the correct next step. The bank may direct you to a branch or provide an official form or secure process.

What to do after the number is changed

Do not assume that the update is complete simply because you submitted a request. Check the result carefully.

1. Wait for the bank’s official confirmation, if one is provided.
2. Check whether alerts or verification messages now arrive on the new number.
3. Review your mobile-banking and internet-banking profile.
4. Test only a low-risk service or contact customer care if you are unsure. Do not make a large transfer just to test the change.
5. Remove the old number from banking-related devices or profiles where it is no longer needed.
6. Secure the new SIM with a strong device lock and a SIM PIN where supported.

If the old number belonged to another person, update the bank immediately. A recycled phone number could eventually be assigned to someone else, creating a risk if it remains connected to your account.

Common problems and the safest response

The old SIM is lost or stolen

Contact your network provider to block the line and inform your bank. If you still have access to your banking app, check for unusual transactions and change your banking password through the official platform. If you suspect fraud, use the bank’s urgent fraud-reporting channel.

You changed your number but are not receiving OTPs

Confirm that the bank recorded the correct number and ask whether OTP delivery has a separate activation process. Check mobile signal and messaging-service issues, but do not repeatedly request codes if messages are delayed. Never share an OTP with anyone.

The account is jointly held

The bank may require additional authorisation or separate updates for joint-account holders. Ask the bank what applies to your account rather than assuming that one person’s request changes every profile.

You are outside Nigeria

Start with the bank’s official international customer-care channel or secure online banking service. If a branch visit is required, ask whether a Nigerian branch, embassy-related document process or another approved identity-verification route is available. Requirements differ between banks.

How to avoid phone-number update scams

• Do not click unexpected links claiming that your account will be blocked unless you update your number.
• Do not install remote-access software at the request of a supposed bank representative.
• Do not share your OTP, PIN, password, card PIN or recovery details.
• Do not post your account number and phone number publicly while asking for help.
• Verify contact details from the bank’s official website, app, branch materials or statement.
• Report suspicious messages to the bank through its official fraud channel.

The practical takeaway

The safest route is simple: use the bank’s official app if the feature is available, contact verified customer care for guidance, or visit a legitimate branch when identity verification is required. Keep control of your SIM, protect your banking secrets and confirm that alerts and transaction authorisation now point to the correct number.

For Nigerian account holders, changing a phone number is not merely an administrative update. It is an important account-security step, especially after a lost SIM, a stolen phone, a change of network or any suspicion that another person may access your messages.