According to FBR Research, the contracted partners for the iPhone are as follows,

Samsung Electronics (applications/video processor)
Marvell (802.11)
Infineon Technologies (baseband)
Broadcom Corp. (touch screen controller)
Cambridge Silicon Radio (Bluetooth)
Foxconn International (assembly)
Foxconn Tech (mechanical parts)
Catcher (stainless casing)
Cheng Uei (connectors and cable)
Entery (Bluetooth module)
Unimicron (PCB)
Tripod (PCB)
Largan Precision (camera lens)
Altus (camera module)