Are you looking to enable a Bluetooth device and pair to your iPhone 3G But Don’t know how to do it, here i will tell how to do this!

Follow the Steps Below : 
1. Set the Bluetooth device to discover.

2. From the Home screen, select Settings.

3. Select General.

4. Select Bluetooth.

5. Set Bluetooth to On.

6. The iPhone starts searching for Bluetooth devices. It should show the screen where you can enter the PIN code. Enter the PIN (usually found in the manual). Then be prepared to use the Bluetooth device with iPhone.