Mobile payment provider BilltoMobile announced it has completed an agreement with wireless carrier Sprint Nextel Corp. The agreement allows Sprint subscribers to charge purchases of digital goods from BilltoMobile's online merchants directly to their wireless bills.

Direct mobile billing methods are particularly popular with gaming sites where younger players may not have access to credit or debit cards.

Denise Archer, vice president of carrier partnerships for BilltoMobile said, "BilltoMobile is the only mobile payments gateway that can offer online digital goods and services merchants the technology infrastructure and broad consumer reach necessary to provide customers with a viable mobile payment option."

With this agreement BilltoMobile now as partnerships in place with three of the four major wireless carriers, including Verizon Wireless and AT&T Inc. According to the announcement, BilltoMobile is available to 240 million wireless subscribers in the United States, or approximately 85 percent of the wireless market.

BilltoMobile is headquartered in San Jose, Calif. It is majority-owned by South Korean Danal Co. Ltd.