The Redwood City, Calif., mobile phone payment provider Obopay Inc. is working with two San Jose companies to promote its service to businesses.

Obopay announced Tuesday that Cellfire Inc., a provider of coupons that can be redeemed through cell phones, and that Xringer Inc., a maker of software that lets people use their phones to make remote purchases, would use the service.

Though Obopay has long pitched its service as a means of making purchases, until recently it has been promoted primarily for person-to-person payments.

With these two partnerships, merchants "can quickly plug in a comprehensive set of m-commerce capabilities into their digital applications to allow consumers to pay for what they want, whenever they want," Carol L. Realini, Obopay's chief executive, said in a press release.