A pedestrian using a mobile phone walks past an advertisement poster of Apple's new iPhone 5S and 5C in TokyoNEW YORK (Reuters) – SoftBank Corp mentioned on Friday it agreed to pay $1.26 billion for a 57 percent stake in privately held cellular phone distributor Brightstar Corp. After the deal SoftBank, the eighty p.c owner of No. three U.S. cell operator Dash Corp, said Brightstar would turn out to be the exclusive supplier of handsets to a couple SoftBank associates. (Reporting by Sinead Carew; Enhancing via Gerald E. McCormick)