ever since I got some interference on a recording last year, I've started putting my phone in "airplane mode" during shows..... haven't had the problem since, though I guess I couldn't swear that doing that fixed the problem, could just be a coincidence since I used to leave my phone on all the time and never had any issues before that..... and yeah, I have AT&T.... with my old desktop, I used to know I was about to get a phone call because I could hear the interference coming through the computers speakers (even if the phone wasn't in the same room with the computer) a couple of seconds before the phone would start ringing.....