Banks have warned Apple Pay customers that storing friends’ and relatives’ fingerprints on their devices violates their account terms and conditions.

Several of the UK’s leading banks have told customers that they are failing to keep their personal details safe by storing their fingerprints on iPhones which are not their own.

This will be treated as a violation of the terms and conditions that customers have with their banks, entitling banks to refuse to provide refunds for disputed transactions.

Apple allows iPhone users to store up to ten different fingerprints on their devices, which are used to unlock phones.

However, Apple’s Touch ID system is also used to authorise payments through Apple Pay, meaning that anyone who is able to unlock a device with their fingerprint can also make purchases on the same device.

Lloyds, HSBC and First Direct have warned users that they are can refuse to refund customers who claim they have been a victim of fraud if they have stored their fingerprints across multiple devices.

Lloyds’ terms and conditions read: “If Touch ID is available on your device, you must ensure you only register your own fingerprints (and not anyone else’s).”

“Our customers’ financial safety and security is of the utmost importance to us. As such we advise all our customers to keep their details as secure as possible,” a spokesperson for HSBC said to the Telegraph.

“This means not sharing their PIN or in the case of Apple Pay not letting others access their phone.”

Apple Pay was launched in Britain in July, with Barclays being the only major UK bank not to offer the service to its customers at present.

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