Yes, you can use the bluetooth devices with hands free bluetooth handset or car kit. Apple Wireless Keyboard. iPhone also supports using iPod with Bluetooth stereo headphone devices.
Procedure To Pair Bluetooth Devices
1. Follow the instructions that came with the device to make it discoverable or to set it to search for other Bluetooth devices.
2. On iPhone In Settings, choose General > Bluetooth and turn Bluetooth on.
3. Choose the device on iPhone and enter its passkey or PIN number. See the instructions about the passkey or PIN that came with the device.
After you pair a Bluetooth device to work with iPhone, you must make a connection to have iPhone use the device for your calls. Note: You can pair only one Apple Wireless Keyboard with iPhone at a time. To pair a different keyboard, you must first unpair the current one.
When iPhone is connected to a Bluetooth device, outgoing calls are routed through the device. Incoming calls are routed through the device if you answer using the device, and through iPhone if you answer using iPhone.