Sprint Nextel Corp. officially started offering a downloadable banking application for mobile devices last week and said four banking companies have signed up to use it.

The Overland Park, Kan., wireless carrier said the MyMoneyManager application was available to customers who have bank accounts at BB&T Corp., Citigroup Inc., International Bancshares Corp. of Laredo, Tex., and PNC Financial Services Group Inc.

The download had been available in "soft launch" since April.

PayPal Inc., the online person-to-person payment processing unit of eBay Inc., is providing fund transfer services, Sprint said.

The application is available at no additional charge to Sprint subscribers who have a service plan that includes data, the carrier said.

The technology underlying the application was developed by mFoundry Inc. of Sausalito, Calif. Citi also uses mFoundry's technology for its Citi Mobile application.

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