The British and Irish Lions' scrum half has hired the agency to handle his personal PR.
FPM has been charged with rolling out an integrated campaign aimed at increasing Phillips' profile. It will also aim to attract sponsorship and endorsement opportunities for the Ospreys star.
Phillips was hailed as one of the outstanding players of the recent Lions tour of South Africa.
Phillips is the most recent addition to FPM's expanding sports division of clients, which includes Crystal Palace football club chairman Simon Jordan and Aston Villa's Nigel Reo-Coker.