BBVA announced Monday it now has more than 15 million active mobile banking users.

BBVA said the number of customers using mobile as their preferred way to access the bank's services has grown by more than 40 percent in the last 12 months, according to a press release. The bank claims the levels of interaction with the bank via mobile are also accelerating as more and more services become available.

In Spain, for example, where 92 percent of products and services will be available via mobile by year end, interaction rates have multiplied by almost two and a half times in a little over a year — from 23.8 million interactions per month in May 2016 to more than 56 million 12 months later. Meanwhile, during that time, visits to the website from non-mobile devices grew slightly by a little over 2.5 million interactions a month, according to the release.

"It's a great, and expected, milestone to have passed," Derek White, BBVA's global head of customer and client solutions, said in the release. "It's been clear for a long time that as customers do more and more on their phones, from chat services to sourcing information to buying things, banks need to be where their customers are and offer a great experience."