Your iPhone's Settings Menu Options
Check out your Bluetooth options.
On the iPhone, you can use Bluetooth to communicate wirelessly with a compatible Bluetooth headset or hands-free car kit. With the optional iPhone Bluetooth headset that Apple sells, you can automatically pair the devices by placing the iPhone and headset in a dual dock (supplied with the headset), which you connect to your computer.
If you’re using a third-party accessory, follow the instructions that came with that headset or car kit so that it becomes discoverable, or ready to be paired with your iPhone. Then turn on Bluetooth in Settings so that the iPhone can find such nearby devices and the device can find the iPhone. Bluetooth works up to a range of about 30 feet.
You know Bluetooth is turned on when you see the Bluetooth icon on the status bar. If the symbol is blue or white, the iPhone is communicating wirelessly with a connected device. (The color differences provide contrast to whatever is behind the icon.) If it’s gray, Bluetooth is turned on in the iPhone but a paired device isn’t nearby or isn’t turned on.
To unpair a device, tap it from the device list shown so that the word Connected becomes Not Connected. Tap the device again to reconnect.
To divorce a Bluetooth device from the iPhone, tap the right arrow in the blue circle to the right of the Bluetooth device you’re unceremoniously dumping. On the next screen, tap Forget This Device. At least you won’t have to pay alimony.