Person-to-person payment is expected to be one of the big next deployments for mobile financial services, and ING Direct is an early adopter of the latest incarnation of the technology, becoming the first major financial institution to enable U.S. customers with iPhones to use them to send money to one another.

The U.S. online bank, whiich is owned by ING Group NV, is using Bump technology, allowing its Orange checking account customers to send money by entering a dollar amount and bumping their iPhones together.

That will initiate an instant payment between the Electronic Orange Accounts.

The service builds on ING's existing email-based, person-to-person payment feature, available on BlackBerry and Android banking apps or its mobile website.