The title says it all.
This is a difficult one for me to troubleshoot...in part because it's my son's device and he is in Australia (I am in the US).
This is our primary means of communication. I'm speculating that there is something happening in the headphone jack that would allow this to happen.
Strange is that the headphones that he is using do not have a built-in mic. –
Thank you in advance for helping me with this!