I have a bluetooth phone and use it with the car and my laptop. When I turn the car on, it detects the phone so I can use the phone through the car. So if someone rings, it answers automatically, and the music turns off, and I can hear the person through the car speakers, and there's a little microphone above my head which picks up my voice so it's all completely hands free. To make a phone call, I press a button on the steering wheel, then can select someone from my speed dial list from the screen in the car and call them while the car is in motion. Yes, it's a high tech car...
With the laptop, I can press a button which then detects the phone and upload pictures and my phone book contacts into the laptop.
You can get bluetooth headsets for the phone which you just stick over your ear and there's no wires that connect the earpiece to the phone, which is convenient.
If you don't have anything to pair the phone with though, bluetooth is completely useless!