Apple's iPhone includes the latest Bluetooth 2.0+EDR technology but is essentially 'crippled' since only Handsfree and Headset profiles are supported.
Right now iPhone does not support A2DP, OBEX or DUN which means you can't have stereo wireless headphones, you can't send/receive files via Bluetooth and you can't use it as a modem.
Sign the petition to ask Apple to add these common Bluetooth Profiles to iPhone via a software update!