[Eponymous]

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My friend has his RAZR bluetoothed into his brand new 3-series BMW and whenever his phone rings while he's in the car, the car itself rings and displays the callerID info on the console monitor. You can then hit the button and take the call using the car's speakerphone. I thought that was pretty awesome, given that you don't have to do anything at all after the initial setup (i.e. no plugging the phone into the car when you get in, etc.).

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In addition, when making calls, you can select from the names that are already in your phone directory by using the buttons on your steering wheel. You just scroll through the list of names that shows up on the monitor and press a button to dial. Much safer and more convenient than using the phone itself. You can also dial a number by pressing a button to activate voice commands and say, "dial 410 xxx xxxx".

Also, if you have the navigation system, when you select a hotel, restaurant, etc., from the travel information, you can call them with a press of a button to get rates and make reservations. It works really well, especially considering that BMW's interface to their electronics is usually pretty poor. I imagine other luxury makes have equivalent or better set-ups.