If you think you have been scammed, call your bank or card provider to report it immediately. “You can also report a stolen card on most banking apps,” says Lisa Webb, a consumer law expert at the consumer group Which?. It is harder to report fraud itself via a banking app, so you may still have to call a number. He adds that this is not very common but, when it does happen, it can be “devastating.”To avoid this, you should be careful with personal details, especially anything sent over e-mail. If you suspect you may have had personal details stolen, you should keep an eye on your credit file using a credit reference agency.