Which mobile is used by jeff winger in tv show community on star world?

please if you know,list which mobiles are used by other stars too in community like britta,abed,troy,annie,pierce and shirley.i saw it in day befor yesterday's episode on 8th May in which abed and troy proposing to a girl they both like but she has to chose 1 of them and jeff is having party with that chinese guy and his professor .sorry i didn't saw whole episode but i did see it for like last 10 minutes.there i saw their mobiles.