Echo problem when using iPhone earbuds
I usually use the iPhone earbuds when I talk on my iPhone 4 and they've always had clear sound. Since I installed OS 6 I hear a lot of feedback and my voice echoes. This only happens when I plug in the earbuds after I'm on a call - if I make a new call with the earbuds already plugged in the sound is clear and doesn't echo. Does anyone else have this problem and if so, how do I fix it?
iPhone 4, iOS 6