[Galaxy Note GT-N7000 Accessories] ChaosSoldier:
I'm assuming that not a whole lot of people here are really into cars. I am really into modding my car and one aspect of that is audio. I love car audio and have a moderately nice system in my car. I can say that if you're looking for a good way to integrate your phone as your main source of media, then perhaps a new head unit would be a great upgrade for both your media and for your car.

Some people may be on a tight budget, and if so then the previously mentioned solutions may be the only options viable to you, but if you are willing to branch out and see what you can do with your ICE (in car entertainment), then you may find something that you might want to invest in.

So what are the options? You can use a wired fm transmitter, and as people have mentioned, you're dealing with wires and such. You also have wireless fm transmitters, which eliminates your wiring, and your results don't stray far from the wired transmitters in terms of sound quality. If you're willing to upgrade your headunit, then you have two options, single dins which is the base tier headunit. It has most, if not all, of the features your stock headunit has, and a few extras. If it is equipped with bluetooth, you can send/make calls from the headunit, but most single dins don't solve your audio needs in this way. What you want to look for is if it equipped with USB, so you can connect your phone via USB and play your music that way. Yes it does involve wiring, but there have been many ways to tie in a nice docking station for your phone to really make it appealing to many users. Double dins are almost always touchscreen type headunits and are a great way to upgrade your system. They have many more features that single dins will not have, such as GPS, movie viewing, etc. These types of headunits will follow single dins in that you will be wiring your phone via USB to source your music. I think there may be some double dins that are capable of bluetooth audio but I am not totally sure as mine does not have that feature as a 2011 model from Alpine.

W W W[dot]thebizzy[dot]com/technical_pages/thebizzy/audio/ipod2.jpg

Here is an example of how many users like to mount their phones/ipods/etc.

I will say that the benefit of a wired connection over a fm transmitted connection is that the sound quality is so much better. Music is much more crisp and clean with none of that distortion. Granted your overall sound quality will be determined by the quality of your speakers, but the differences from a USB connection and an fm transmitted connection are really noticeable.

So think about what your budget is and what you really want in your car audio system/integration. I went with a double din because the features are just spectacular. I do want to note though, that a headunit does not make your car system sound better, you need to upgrade your speakers, amps, subwoofers, etc. The main purpose for a new headunit is features. For me, I went with the double din because of benefits such as GPS, bluetooth (syncs my entire phonebook so I can just search for people whom I need to contact, shows recent call logs, auto answering for incoming calls), better interface when selecting music (it can utilize the entire interface of the ipod giving me access to movies, artists, playlists, genres, etc.), and overall ease of use.

So to conclude I'd recommend you find out what you want, and what your budget is, and start a project because my daily commute is worlds better than what it used to be because I made my upgrade happen. If you have any questions about ICE then feel free to ask.