Twentieth Century Fox has greenlighted production of a 24 spin-off that will air exclusively for cell-phone users, Variety reports. Titled 24: Conspiracy, the show will feature new characters and unfold over 24 one-minute episodes. It'll debut in the U.K. on Jan. 30 before arriving in the U.S. next spring. In the meantime, rumor has it Fox is working on a series of spoiler-rich promos that will take all the fun out of watching.