Odd GSM Buzzing

[gca412]

Hi,

I've noticed that when I use my iPhone 6S to make a call with the lightning cable attached
there is a very distinct buzzing noise from the ear piece. It sounds very much like GSM buzz
and completely disappears if the lightning cable is removed. It only seems to happen during
a GSM call, not 3G or 4G. Anyone else notice this?

 

[Jay43]

It happened to some iPhone 5's as well. Just take it back to the apple store and they should replace it.