Royal Bank of Scotland (RBS) and NatWest have launched new technology allowing customers to withdraw money from a cashpoint using their mobile phone.
Instead of inserting their debit card, customers with a mobile banking app can use the GetCash service to withdraw up to £100.
When they make a request for funds from their current account, they will be sent a six digit number to enter at the cashpoint.
Providing they use the PIN within three hours, the cash will be released.
The service can be used on an unlimited number of occasions.
Ben Green, head of mobile at NatWest and RBS, said the service would be particularly useful if people forget their debit card or do not want to carry it with them on a certain day.
"We've heard countless stories from customers who've left their wallet behind, or parents who need a quick way to send money across to their children immediately," Green said.
Customers with an iPhone, iPad, Android or BlackBerry handsets can download the app.
Banks are competing with each other to launch mobile phone banking apps.
Earlier this year, Barclays unveiled its Pingit app which allows users to receive and send money to anyone with a UK current account and UK mobile phone number without the need to share bank details.
This service allows money transfer without the need to disclose their bank details, as those who wish to send money only need the recipient's phone number.
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