The cell-phone industry's ruthless fight has spilled over into NASCAR, and landed squarely on the hood of Jeff Burton's #31 Chevy. AT&T's wireless unit, formerly known as Cingular Wireless, planned to file a lawsuit later on Friday in Atlanta's U.S. District Court against NASCAR. The suit will center around AT&T's sponsorship on the #31 Chevrolet driven by Burton. The car has traditionally been sponsored by Cingular, with its familiar orange paint scheme. Though federal regulators approved AT&T's acquisition of BellSouth and its wireless unit Cingular on Dec. 29, NASCAR will not allow AT&T logos to appear on the #31 car because it would violate its current agreement with Sprint Nextel, which owns the naming right to NASCAR's top series. "We're filing a lawsuit to protect the right to transition from Cingular to AT&T on the #31 car," AT&T spokesperson Clay Owen said Friday afternoon. NASCAR officials were not immediately available for comment. Burton's car will continue to sport the Cingular Wireless paint scheme for this weekend's Kobalt Tools 500 at Atlanta Motor Speedway.(Atlanta Journal-Constitution)(3-16-2007)