I've had a repetitive clicking noise while on speakerphone ever since the upgrade. The party on the other side doesn't hear it. I don't hear it if I just have the phone to my ear - only on speakerphone
I've experienced a similar problem. The first time, I could hear a strange noise, but I wasn't sure where it was coming from. It happened several times before I could trace the noise to my phone. It reminded me of the noise a camera shutter makes when it takes a picture. Later, while talking to my brother, I heard the static noise several times while I was using Bluetooth. It hasn't happened for a few days. My brother never mentioned it, so I assume he didn't hear it.
My son and I have Charges and after the update only his has the clicking/static sound during calls. He hears it in the phone speaker when it is up to his ear. He says it is a clicking or camera shutter type sound that is repetitive every few seconds. Would be nice to get rid of that as all else works very well and better battery life.
I have this too since the update. It is intermittent and only on speaker. If I am on bluetooth or hold the phone to my ear, it does not happen. It is sort of a static/howling sound. Makes it very hard to understand the other person, who does not hear it. It does not happen that often so I have not worried about it.