With ios 6 on my iphone 4s i never had any problem with phone calls over bluetooth through my pioneer stereo. I also didnt have any problems on the first couple ios 7 betas but on the last couple including the GM everyone i call is complaining of echoes. This was on my iphone 4s and the same thing has been happening on my iphone 5S. Is anyone else experiencing these problems or is it time to look into a new bluetooth adaptor or possibly a new nav unit?