Hi everyone,

like many others, I have my new 8400 recently.

I like everything about this unit. However, my friend told me that when I talking through BT, he could hear a low constand buzzing noice. I had U310BT before 8400, and I dont think it has this problem. When I replaced the unit, I left the mic along, as they seemed to be compatible. First I thought was the mic that is causing the promble, so I replaced it and nothing happens.

Does anyone has the same problem? Is there any way to fix it?

I have been told it sounds like there's a little noise in the background. Have a friend trade phones and call each other with your friend in your vehicle.

I have had this complaint too.

The fix I have at the moment is to pull the AppMode cable out before answering the call. It seems that the cable is causing some kind of interference.

I tried a few positions yesterday of the phone in mount, when I took it from the mount and hung it down it had no buzz according to my wife listening at the other end.

I will probably try to remount the iPhone elsewhere whilst speaking to the wife to find a location without buzz.