We work hard to make your online purchases simple, convenient and safe from fraud. Your new Mastercard® Citi Debit Card uses Mastercard® SecureCode™ as a quick and sophisticated way of identifying yourself to Citi Security when shopping online.
Mastercard SecureCode uses One Time Passwords as an enhanced way of authenticating certain transactions, thus helping to protect you from card fraud.
Holders of a Mastercard Citi Debit Card are automatically registered with Mastercard Securecode.
To ensure you receive a One Time Password, it’s vital your current mobile number is registered with Citi.
The last four digits of the mobile number we hold for you are displayed at the top of the Mastercard SecureCode box.
If you haven’t registered your mobile number with us, or if you think the number we have for you is out of date, please call us on +44 207 500 1445 to update your mobile phone number.