No, the snap-in only charges the phone and optionally connects the phone to the car's antenna (if the phone is capable).

Playing music is a totally different adaptation. If you have a newer car, your radio will have the aux input. That is usually the easiest way to play music from an iPhone. If you have a 2002 or earlier, then you either need to upgrade to a New Gen radio, get one of those CD changer emulator adapters, or hard wire into the radio's tape input.

I have an iPhone, Bluetooth, and a radio with aux input. Because of all that, the snap-in is useless. I have a dock adapter cable that both charges and feeds the phone's line-level output into the car's aux input. In a totally cool world, I could install a snap in, and modify that dock plug to grab the same line level output. However, my hunch is that the snap-in lacks those wires and a home remedy mod probably would not work out that well.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input