For any questions about your TalkTalk mobile service.
Monday
A message come to my phone saying there was a risk of viruses and telling me to place my credit card against the back of the deice to scan it or enter credit card details manually. I have not done
so. I've rung my bank and was advised to ignore the message. I think my bank is right and I shouldn't give anyone my credit card details unless I understand why.
Monday
Absolutely correct, @A2bcd.
Also block the sender and delete the message.
It would be wise to run genuine antivirus and Malwarebytes checks on all your devices however.