The UK's high street banks are warning that millions of account holders are vulnerable to fraud - both online and over the phone.
The banks have launched a campaign, with help from the police, to make customers more aware of the impending threats.
They have posted a list of eight things the banks would never ask account holders to do, which includes asking for a full pin or banking password over the phone and via email.
Chief executive of the British Bankers Association, Anthony Browne, said: "Being defrauded is a devastating experience for anyone, which is why we are launching this campaign.
"The more people know about fraud, the less likely they are to become victims."
The campaign highlights the dangers of vishing - a term that refers to fraudsters who telephone victims to say there has been fraudulent transactions on their account.
Believing they are speaking to the bank, victims often disclose their account numbers and passwords directly to the fraudster -who will use the information to steal money.
To begin the campaign, three major UK banks are printing thousands of leaflets, to warn their customers about such scams.
The eight things a bank would never do are as follows:
• Ask for your full Pin number or any online banking passwords over the phone or via email
• Send someone to your home to collect cash, bank cards or anything else
• Ask you to email or text personal or banking information
• Send an email with a link to a page which asks you to enter your online banking login details
• Ask you to authorise the transfer of funds to a new account or hand over cash
• Call to advise you to buy diamonds, land or other commodities
• Ask you to carry out a test transaction online
• Provide banking services through any mobile apps other than the bank's official apps.
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