Mobile payments users spend nearly twice as much through digital channels overall than people not buying on mobile devices, according to a survey of 25,000 U.S. and European consumers carried out by consulting firm Bain & Company.

However, concerns over security, privacy and convenience keep 80 percent of consumers from changing their payment behavior and using mobile payments, Bain found.

The survey results, covering consumers in the U.S., U.K., France, Germany and Spain, appear in Bain's "The Consumer View of Mobile Payments" study.

While more than half of consumers on average, and more than 70 percent in Western Europe, are aware of mobile payment options, only a quarter of those surveyed are willing to use their mobile device for in-store payments, the survey found.

"The case for mobile payments has been a long time in the making, but still remains unconvincing for many consumers," Stephen Bertrand, partner and head of Bain's Technology practice in EMEA, said in a statement. Bertrand is lead author of the study.

The key to persuading more consumers to switch over from debit and credit cards to mobile payments is to convince them about the benefits of mobile payments such as faster checkouts, discounts, promotions and access to real-time balances and location-based marketing offers, the study argues.

"Consumers are voicing their willingness to change payment behaviors," Bertrand said. "It's now up to mobile payment providers to deliver solutions that unlock the long-awaited potential of mobile payments."