I searched a bit on this website for a topic related to this, but no luck. On google I found someone tapes aluminum to the back bottom right corner of his iphone to prevent this. But in my car, when playing music off my iphone through my deck, I hear popping in my car speakers. Now no popping comes through my cars speakers when I play a disc or use a USB drive...so this tells me my iphone is the source of this. A quick restart helped, but a few days later it came back. Any advice? thanks! PS- the only conclusion I have is to use airplane mode. BUT, 1) its late so I will test that out tomorrow and 2) I NEED airplane mode on cause my job requires GPS!