The Bend, Ore., mobile advertising provider RocketBux Inc. has signed a memorandum of understanding to deliver digital coupons to the mobile phones of people who use nFinanSe Inc.'s prepaid cards.

Once cardholders sign up for RocketBux's system, merchants can send those consumers coupons after a transaction. The coupons include a link to a bar code that can be scanned from the phone's screen at checkout.

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