First National Bank's (FNB) banking app is now active on more than 1 million smart devices, the bank announced on Tuesday.

FNB's app was launched in 2011.

The bank revealed in a statement that on average the banking app customer logs into the app 15 times per month, and a significant portion of customers log in over 40 times a month.

Usage trends over the last three years show that the most popular transactions on the app are payments, account transfers and prepaid products.

Other popular transactions are said to include Send Money, LOTTO & Powerball, Geo Payments, iTunes gift codes, and card services such as cancellations, upgrades and ordering of new cards, the statement noted.

"The app has grown phenomenally fast in the last three years to reach 1 million active devices. The biggest growth spurt was during the past year growing at 65% from October last year till this year," said FNB Digital Banking's Giuseppe Virgillito.

"Users of the App have reduced their reliance on branches, ATMs, and call centres to almost zero transactions per month.

"With continuous development and growth of this channel, we will be able to offer more value, convenience and cost savings to our customers, building on our digital ecosystem and reducing the dependency on cash and physical banking infrastructure," said Virgillito.

According to the 2014 Mobility survey the use of a banking apps as the primary bank channel usage increased from 1% in 2012 to 9% in 2013, and this is expected to increase significantly in the coming years as more people gain access to smart devices.