The title says it all, when i have my S6 plugged into my AUX i get an echo. Well to be more accurate the person on the other line gets an echo i hear things fine. The sound comes out of my car speakers. I have a case on the phone but there are holes by the noise canceler and other ports. I just returned my Iphone 5 and didn't have an issue so i don't think its the cord? I had two phones in the last 14 days, both Samsung s6's so i don't think my phone has an issue, unless both s6's had the issue. Im guessing a setting of some sort?