In the older iPhones you could put someone on speaker, play a song through iPod and you could talk to someone on speaker and you could hear the music coming out of the speakers and the other person could hear the song thats coming out of your speakers. With the iPhone 4 if you play a song while on speaker talking to someone they DO NOT hear the music no matter what (which is kool) BUT the music quality is AWFUL! Someone with an iPhone 4 check it out. Call someone, put your phone on speaker, play a song and see how AWFUL the quality is and also notice that the other person does not hear the music.