FORT WORTH, Texas — While the emergence of mobile phones as a new path for retailers to market themselves and for consumers to pay digitally, the trend also poses a potential minefield for data security, as each mobile phone represents a chance for breach.Speaking before about 175 people at Arlington, Texas-based The Pinnacle Corp.’s annual users conference, Rick Dakin, CEO of Coalfire, Louisville, Colo., a data security analysis and auditing firm, said retailers need to prepare for a new level of vulnerability where answers are few.