How to Link Multiple Phone Numbers to One Nigerian Bank Account

Many Nigerian bank customers use more than one phone number, especially when they have personal and business lines or SIM cards from different mobile networks. This creates an important question: can multiple phone numbers be linked to one bank account?

The answer depends on the bank, account type and service involved. A bank may allow multiple contact numbers to be recorded as customer information while still requiring one specific number for USSD banking or transaction authentication.

Why Do Customers Want Multiple Phone Numbers?

• They use separate personal and business lines.
• They have two active SIM cards.
• They use different networks for coverage.
• They want an alternative contact number.
• They changed numbers but still use the old line.

Does One Account Automatically Support Multiple USSD Numbers?

Not necessarily. USSD banking commonly depends on the mobile number registered for that service. A bank may store multiple contact numbers but still designate one number as the transaction-enabled or USSD-linked number.

This distinction is important. Having two phone numbers in a bank’s records does not automatically mean both numbers can initiate USSD transfers.

How to Find Out Whether Your Bank Supports Multiple Numbers

Contact your bank through its official customer-service channel and ask whether multiple phone numbers can be linked to your account and, more specifically, whether more than one can be used for USSD transactions.

Do not assume that a feature available at one bank is available at another.

How to Add or Update a Phone Number

Step 1: Use the Bank’s Official Channel

Some banks provide mobile-app or self-service options for changing customer information.

Step 2: Verify Your Identity

Because a phone number can be used for transaction authentication, the bank may require identity verification before making the change.

Step 3: Confirm the Number

The bank may send an OTP or another verification message to confirm control of the phone number.

Step 4: Confirm USSD Eligibility

If your purpose is USSD banking, ask whether the newly registered number can be used for USSD transactions.

Can Two Numbers Receive Transaction Alerts?

This depends on the bank’s alert system and account profile. Some banks may allow multiple contact details, while specific transaction-alert configurations may have their own rules.

What Happens When You Change Your Primary Number?

Changing the number associated with your account can affect USSD banking, OTP delivery, transaction alerts and mobile banking security.

Before abandoning your old SIM, make sure the bank has updated your profile and that your new number works correctly.

Can You Use Another Person’s Number for USSD Banking?

You should not assume that another person’s number can safely or legitimately be used to operate your account. USSD services are designed around registered customer information and authentication.

Contact your bank if you need to change the number linked to the account.

What If You Lost Your Registered Number?

Contact your mobile network provider to recover or replace the SIM where possible. Also notify your bank if you suspect that the number could be used to access banking services.

If the phone and SIM were stolen, treat the situation as a security issue and contact both the network provider and bank promptly.

Multiple Numbers and Banking Apps

Mobile banking applications can have separate device-registration and security controls. A phone number being registered with the bank does not necessarily mean the same number can independently operate every banking channel.

In 2026, the CBN also introduced additional security standards relating to mobile banking applications and device changes, including controls around app-device linking.

Can a Business Account Have Multiple Contact Numbers?

Business accounts may have several authorized contacts or signatories, depending on the account mandate. This is different from allowing multiple phone numbers to independently initiate transactions.

Security Tips

• Keep your registered phone numbers current.
• Remove numbers you no longer control.
• Never share OTPs.
• Report a stolen SIM immediately.
• Confirm changes through official bank channels.
• Check transaction alerts after changing your number.

Final Thoughts

Whether multiple phone numbers can be linked to one Nigerian bank account depends on the institution and service. A bank may record several contact numbers while still limiting USSD transactions to one registered line.

If you need to add a second number, contact your bank and specifically ask whether the number will be used for alerts, account communication, USSD transactions or another banking service.