How can I turn on Bluetooth and rename the device?
In the Connected devices option of Settings, select Pair new device and the Bluetooth phone function will turn itself on.Alternatively you can turn Bluetooth on via the Quick settings bar from the home screen by touching the Bluetooth button.
You can name your phone to make it easier to recognise. This name will be visible to others. To do this select Pair new device, touch Device name, you will see a pop up which enables you to delete the existing name and rename the device.