I have a GPS that is also a Bluetooth hands free device. I have the Garmin Nuvi 660: (
https://buy.garmin.com/shop/shop.do?cID=134&pID=400 ) (which I got on sale. Don’t pay the price listed on garmin.com). Several other models have this feature as well.
Once configured, the GPS uploads my phone book every time it connects with my phone. It’s a touch screen: I can touch a phone icon, then the phone book icon, then select the person I want to call. There is a microphone on the front of the GPS, and speakers in the back. Or, the GPS has an FM transmitter. Tune your car radio to the right frequency and hear the person you are talking to over your car radio. It also plays MP3’s, either through its speakers or over your radio. The route directions it gives can also be heard over your radio.
If someone calls you, you hear your normal ring tone through the GPS (or car radio), and the GPS screen says “incoming call from X.” There is a big green button to press which answers the call. After you answer the call, the button turns red, which terminates the call.
The POI (point of interest) database has like 6 million items. You can search for, say, Italian restaurants. It will give you a list. The list has their phone numbers. You can select from the list of Italian restaurants, see the address, the location on the map, and press one button to call them.
Some of the other features of this GPS include live traffic updates, which automatically update your route and arrival time based on the expected traffic delay, an MP3 player (I’ve uploaded 6 or 8 CD’s, and there is room for more, plus you can add a memory card), Text to speech (it speaks street names), etc.
Plus, you can move this from one vehicle to another.
I know I sound like a Garmin salesman, but I’m not. It’s just a really good device. Other brands have similar features.