This page shows the operating system each phone is on: 

Nokia                     :          3250, 5300, 5320 Xpress Music, 5500, 5700 Xpress Music, 5800 Xpress Music, 

(Series 40/Symbian/S60)       6110 Navigator, 6120 Classic, 6120 Navigator, 6121 Classic, 6124 Classic,

                                          6220 Classic, 6290, 6300, 6500 Classic, 6500 Slide, 6555, 8800 Arte, E50, E51,

                                          E61i, E65, E66, E71, E90, N71, N73, N75, N76, N77, N78, N79, N80, N81,

                                          N82, N85, N91, N92, N93i, N95, N95-3 NAM, N96

Windows Mobile     :        AT&T 8252, AT&T SMT5700, AT&T Tilt , Docomo HTC Z, Dopod 838 Pro,

                                         Dopod CHT 9000, HTC Fuze/ Touch Diamond/ Touch Dual/ Touch HD/

                                         Touch Pro/ TyTN/ TyTN 2/ XV6800/ iMate JasJam, Motorola Q music 9m/

                                         Q9c/ Q9h, O2 XDA Trion, Palm Treo 800w/ Treo Pro, Qtek 9600,

                                         Samsung BlackJack 2/ Fuze/ i907/ SCH-i760/ SCH-i910 (Omnia)/ SGH-i600/ 

                                         SGH-i780 (BlackJack 3)/ SGH-i900 (Omnia)/ SGH-i907 (Epix)/ SGH-i908 (Omnia)/ 

                                         SPH-i325 (ACE), SoftBank, X01HT, Sprint Mogul/ Touch/ Touch Diamond, 

                                         Swisscom XPA v1605, T-Mobile MDA Vario 2, Orange SPV E610/M3100

                                         Verizon VX6900, Vodaphone 1605 VPA Compact III/ 1605/ 9600 .

Iphone                     :        iphone 2G, iphone 3G

BlackBerry               :       8120, 8130, 9000, 8320, 8220, 8330, 8310, 8110, 9500, 9530

Sony Ericsson          :       K850i, W910, K858, W890, W908, K660, G502, Z750