You can use Bluetooth to connect your phone to other devices without a cord. After you pair a Bluetooth device for the first time, your devices can connect automatically.
Bluetooth uses more of your battery, so turn it off when not in use.
Tap 
To connect with a new Bluetooth accessory or other device, you need to pair with it. You only need to do this once for each device.
Your devices stay paired until you unpair them.
Tap 
As the phone searches for available devices, you'll see 
Do any of the following:
Tap Pair on your phone. Check the other device for a pairing prompt as well; if it has one, you'll need to confirm on both devices or pairing will fail.
Set sharing options if you'll want to share contacts, phone audio, media audio, or internet access.
Can't pair? Troubleshoot the issue.
After pairing with a device, you’ll need to set sharing options and then you can use Bluetooth to:

Turn on the Bluetooth device.

You'll see your phone's name on other Bluetooth devices when you're pairing with them. You can change the name.



When Bluetooth is off, your phone can still scan and automatically connect to a previously paired device. To prevent this, turn off Bluetooth scanning.
To turn off scanning:

If you turn this off, apps that use your location won't work as well.
If you’re having issues with a Bluetooth device, try these troubleshooting steps.