How to Block Account Instantly via USSD
If your phone is stolen, your SIM is compromised or you notice suspicious banking activity, quickly restricting access to your bank account can help protect your money. Several Nigerian banks provide USSD-based security features that allow customers to block an account or card without visiting a branch first.
The exact code depends on the bank. You should use only the official USSD code of your own bank.
Why Block a Bank Account?
Blocking an account can be appropriate when you believe unauthorised access may occur. Common situations include a lost phone, stolen SIM, suspected fraud or exposure of banking credentials.
Account blocking is different from simply locking a debit card or opting out of USSD banking. The action you need depends on what has been compromised.
Access Bank Account Blocking
Access Bank currently provides a dedicated account-blocking USSD service:
*901*911#
Access Bank states that customers can use this code to block their own account or use the third-party option to block an account from another phone.
How to Block Access Bank Account
- Dial *901*911#.
- Select the account-blocking option.
- Choose Self if blocking your own account.
- Follow the prompts.
- Select the relevant account.
- Enter your USSD PIN when required.
- Wait for the successful request notification.
Access Bank also explains that a customer who has lost a phone can use the third-party option from another phone.
What Is the Difference Between Blocking and Opting Out?
Access Bank distinguishes between opting out of USSD banking and blocking an account. Opting out disables the USSD service while leaving other banking channels available. Account blocking restricts access to the selected account through banking channels until it is unlocked.
What If You Lost Your Phone?
Do not wait until someone attempts a transaction. Secure your mobile line with your network provider and use your bank’s emergency blocking facility where available.
Also contact the bank through an official channel if you believe your credentials or account information may have been compromised.
Block the Debit Card Too
If your physical debit card was lost or stolen, blocking the bank account alone may not be the only action required. Use your bank’s card-blocking or hotlisting service as well.
The correct response depends on what was lost: phone, SIM, debit card, PIN or another banking credential.
Can You Block an Account From Another Phone?
Some banks support third-party emergency blocking. Access Bank explicitly provides this option through *901*911#.
The customer should complete the authentication personally and should never reveal the USSD PIN to the owner of the borrowed phone.
What Happens After an Account Is Blocked?
The effect depends on the bank and type of block. Access Bank states that its account-blocking option restricts access through banking channels until the account is unlocked.
Because blocking can affect legitimate access, customers should contact the bank when the immediate security threat has been resolved to understand the correct unblocking procedure.
How to Protect Your Account Before a Problem Happens
- Keep your SIM secure.
- Use a strong phone lock.
- Never share banking PINs.
- Enable transaction alerts.
- Report suspicious transactions quickly.
- Know your bank’s emergency USSD code.
Frequently Asked Questions
Can I block my account without internet?
Yes, where your bank provides an account-blocking USSD facility.
What if my phone was stolen?
Secure your SIM, block the account or card through the bank’s official emergency channels and contact the bank.
Can another person block my account?
Some banks provide a controlled third-party blocking process, but the account holder should complete the authentication.
Does blocking the account cancel the account permanently?
No. Blocking is generally a security restriction, not permanent account closure.
Knowing your bank’s emergency USSD code before a phone or card is lost can save valuable time. Keep the code accessible in a secure place and use only the bank’s official procedure when an account needs to be protected.