Thank you for your well-thought reply.    A couple notes here.   a) If I power the phone via a standalone charger (with or without a grounding pin), the noise is not there.   b) If the phone is fully charged or not, seems to make no difference; the noise is only present when the...

I have a strange configuration. I will try to describe it and why it's setup the way it is.   First, I run and host WebEx-style meetings for hours a day. My phone interface is an iPhone 4S since my landline does not do free toll calls, which drives most of my calls to my cell phone...