How do I play my usb device on my car stereo?

I have a sony cdx GT61UI it car cd player and radio. It has a usb port and an aux. plug to plug in an ipod and whatever else. I have a cord to go from my phone to usb. My phone has ipod like potential in a mass storage file but my radio says It doesn't support the device. Is there a way I can get my phone to play on my radio?

you must format the sd card on the phone and do a fat 16 for the usb to recognize it

Prob not man, if you have a stock radio, no, it will not, if you have aftermarket radio, then it just does not support it. Aftermarket radios are picky, like, mine doesn't support MP3 cds.and such. So yours may not support phone MP3s.

It it isn't matched with USB, you could connect a jack to the audio out or headset jack of the phone to the AUX input of the radio. they are typically RCA or mini jack connectors. You could need the proper adapter cable from the phone to the AUX input.