Prevent iPhone charger from capturing audio My car has an USB connection which I use to connect to my iPhone 4s (with iOS 7.1) as a charger. But the connection also captures audio, so no sound is emitted from the iphone when the usb wire is connected.

Is there any way to control what's the Iphone behaviour when an external device is switched on, just to avoid the audio to be captured?
For a solution that doesn't require jailbreaking and modifying your phone's OS, I would suggest a USB charge-only dongle, like this one or this.

Insert that on the USB end of your cable, and it will only connect the charging pins, not the data pins, preventing any audio or other data from transferring.