Bank of America Corp. has become the top provider of mobile banking services, according to data compiled by the market research company ComScore Inc.

The Charlotte company has said that 2 million of its customers are using its mobile banking application. ComScore estimates that this gives it 35% of the market for U.S. consumers that are using their phones to handle their banking needs.

JPMorgan Chase & Co. follows with a 12% share, Wells Fargo & Co. with 9%, Citigroup Inc. with 5% and BB&T Corp. and PNC Financial Services Group Inc. each with 2%, the data shows.

USAA, which was not included in ComScore's data, has also emerged this year as a contender in mobile banking. The San Antonio financial company introduced last month an application that enables customers to deposit funds into their bank accounts using check images captured with the cameras on Apple Inc.'s iPhones; customers used the technology to deposit $1.5 million in the first three days the service was available.

The number of U.S. mobile phone subscribers is expected to increase to 322 million by 2013, from 291 million this year, according to the Cellular Telecommunications Industry Association and TowerGroup, an independent research firm owned by MasterCard Inc.

The market-share data will appear in the 2010 edition of the ATM&Debit News EFT Data Book, which is scheduled to be published Sept. 24.