Mobile banking customers who own an iPhone (5s or 6) will, as of today, be able to access their accounts online using the fingerprint scanner function on their device.

Customers will also need to download the latest edition of the bank’s smartphone app, downloadable for free via the Apple Store. Customers who wish to continue using numerical passcodes are, however, free to do so.

According to RBS, almost half of its 15m account holders use online banking, with roughly 3m using the mobile app every week. Your Money recently documented the significant rise of mobile banking among bank customers.

At present, almost 2m RBS customers are active iPhone users; almost half this figure (880,000) own the latest iPhone products. RBS claim that an average of 170,000 customers use their app between 7am and 8am on their journey in to work daily. Mobile banking is, according to a bank spokesperson “the busiest ‘branch’ we have.”

Lloyds bank is also currently trialling fingerprint technology.

“There has been a revolution in banking, as more and more of our customers are using digital technology to bank with us,” Stuart Haire, managing director of RBS said.

“Adding Touch ID to our mobile banking app makes it even easier and more convenient for customers to manage their finances on the move and directly responds to their requests.”