NEWPORT BEACH Calif. Specialty hot dog purveyor Wienerschnitzel, based here, earlier this month began offering cellular phone and PDA users digital coupons good for buy-one-get-one-free chili-cheese dogs and discounted chili-cheese fries at 165 Southern California units. Wienerschnitzel customers have access to the digital coupons via their Web-enabled phones or wireless PDAs after subscribing to Cellfire Inc.'s mobile coupon service at  www.cellfire.com. They also can ...

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