Nokia 6263 Hands Free Through My Car Speakers for $40

If you absolutely hate FM Transmitters, read no further, because that's how I pulled off this little feat.

Items I used:
Belkin F8M010 Tunecast III FM Transmitter - Universal
New OEM Nokia 3.5mm Audio Adapter Ad-50 5200 5300 8800 (included with phone)
Universal Car Phone Holder with Multiple Mounting Options(optional)
CELLULAR INNOVATIONS UY-ADT Universal Cigarette Lighter Splitter(optional)

Now the Nokia adapter was included with my Nokia 6263 phone, so I was in luck.

The Belkin Tunecast III installed like a champ. Toss in the batteries, connect it to the AD-50 3.5mm to 2.5mm jack adapter and insert into the phone. Set the radio to an unused frequency (88.3 FM worked great for me) and set the Belkin Tunecast III to match.

The Belkin Tunecast III comes with a DC power adapter for plugging into your car's cigarette lighter, or can be powered off of 2 "AAA" batteries. I recommend using the adapter. If your car is like mine, you only have one plug-in available, so if you want to use your phone's charger as well, you'll need to get a splitter, like the one I've linked above. Completely optional.

I opted to get a phone holder as well for keeping my phone up on the dash and free from sliding around the car. This also made it easy for wrapping the cords and twist-tying them so they were hanging loose all over the place. Again, this is optional.

When placing your phone, make sure it is not too far away from you, as the microphone on the handset is what will be picking up your voice. When you first connect the headset, the phone will ask you if you want to use the microphone. Be sure to select yes.

I did notice some interference when I first attempted to use the phone (slight buzzing), but simply wrapping the extra cord length around the cord track on the Tunecast FM Transmitter seemed to clear it right up.

In making test calls I was able to hear the person on the other end very clearly and loudly through the car speakers, and on the other end they reported hearing only a slight echo, much like a speakerphone. Nothing too distracting.

My main goal was to be able to play my music stored on the phone over my car speakers, and I was very impressed with how the clear stereo sound came out.

Your mileage may very depending on how many stations you have in your area or how close you live to a major metropolitan space. Overall, this is a very cheap method to having an ultimate hands free phone system in your car.