Listening to music from your MP3 player or iPod through your car stereo is extremely popular because it allows you to easily listen to your music while on the road without having to deal with changing CDs. Many mobile phones have music players on them, too, so instead of having to carry around your portable music device with you, you can simply listen to a mobile phone's music player through a car stereo in much the same manner as listening to any MP3 player through a car stereo.
Car stereo with auxiliary input
Plug one end of the auxiliary input cable into the car stereo. Set your car stereo's function setting to the auxiliary cable setting.
Plug the other end of the auxiliary input cable into the cell phone.
Navigate to your cell phone's music player. Push play on the song(s) you wish to listen to through your car stereo. They will transmit through the auxiliary cable and play through your car stereo.
Car stereo with cassette player
Insert the cassette part of the cassette auxiliary adaptor into the cassette drive of your car stereo. Insert the cassette adaptor into the cassette drive with the cord facing down and out the cassette drive.
Plug the auxiliary end of the cassette auxiliary adaptor into the mobile phone.
Open your mobile phone's music player. Push "Play" on the music you wish to play.
Car with power adapter
Plug the power adaptor end of the FM transmitter into the power adaptor located on your car's console.
Plug the auxiliary input cable end of the FM transmitter into the mobile phone.
Turn on your mobile phone's music player. Set the music you want to play.
Turn on the FM transmitter. Tune the transmitter to a fuzzy station. Tune your car's stereo to the same station. Your music should now transmit over the station through your car stereo.
Compose a playlist on your mobile phone's MP3 player beforehand, so you don't have to constantly change the song, or simply put your mobile phone music player on random, or shuffle, mode. Adjust the volume level on your mobile phone and your car stereo to achieve the best sound settings.
Make sure you buy an auxiliary cable size that is compatible with your mobile phone. Mobile phones' auxiliary input sizes vary among makes and models.