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Online Banking

What is a Temporary Security Number and when do I use it?

A Temporary Security Number is a code we use as an additional security measure to confirm your identity if:

  • You're registering for Online Banking for the first time
  • You’ve forgotten your login details
  • You've locked your security number, you're using a browser on a computer or mobile device we don't recognise and we don't have your up to date mobile phone number
  • You've locked your password, you're using a browser on a computer or mobile device we don't recognise and we don't have your up to date mobile phone number.

If you know your security number and security questions, it is possible to call us on 0345 300 3511* and update your mobile number.

Calls may be recorded. *This number may be included as part of any inclusive call minutes provided by your phone operator.


Hi Susan, I can send you a Temporary Security Number (TSN) through the post which will reset your online banking and allow you to get logged in again. This can take between 3-5 business days to arrive and will be valid for 30 days – if you would like me to arrange this for you, please confirm your full name, DOB and postcode in a private message to 'Tesco-Bank'. Alternatively, you can call our Online Helpdesk anytime on 0345 300 3511 and request a TSN to be sent by text immediately once security is completed. 

I changed my phone and mobile number and get the same message, rang the number and was told I would receive a temporary security number within 10 minutes but all I got was a text to say my number was changed 

I’m sorry you've not received it your TSN. It’s possible there might just be a delay in it sending, so it might be worth waiting a little longer. If you still don't receive it, the best thing to do would be to get back in touch with us and we can arrange for another one to be sent. As we can only send it by post here, you'd be best to call our Online Helpdesk again if you need it urgently.  

@Tesco-Bank I rang back and they said they couldn't get access to my account because I failed a security question and that it should of been sent to my number.they said all they can do is send it by post so now it will be another week I won't be able to login

@Tesco-Bank Now I can't pay for anything,it says it needs to send a one time access code and only shows my old mobile number when I got a text to my new number saying it was updated

Sorry to hear this @Witter. If you call the Online Heldesk, they'll be able to help you with this. You can reach them on 0345 300 3511 (24/7) and they will be happy to help. Apologies for any inconvenience. 

Hi I am currently locked out of my account as I have a new telephone number and cannot receive a text. I see customers on this page being told: "message us directly @Tesco-Bank with your full name, DOB and postcode, we'll get this arranged for you!" with regards to obtaining a Temporary Security Number. Every time I click on @Tesco-Bank to send a message, I am sent to a page stating:

"Invalid parameters specified

An invalid set of parameters has been specified in the url.

Return to my original page"

My question is: Do I contact Tesco on this site to obtain a TSN (If so, how); or, do I contact @tescobankhelp on Twitter?

Many thanks

I rang last Wednesday about a security number and they said they would send one out in the post but I still haven't received it 

Hi @Witter, I'm sorry to hear about this. So that I can look into this, could you message me at @Tesco-Bank confirming your full name, DOB and postcode please? - Ainsley

How do I use my temporary security number? I got it today but when i enter my username to login it says my security number is locked