content: A warning comes up when I rise the volume on my phone using ear buds But when I use bluetooth, not only does this warning not appear, but a warning of "This shit is microwave radiation" does not pop up either. Is bluetooth something to worry about? It penetrates concrete walls at pretty great distance. I was always sketched out by it, and only did some basic research after discovering a microwave oven will distort the signal. From what I've read it's safer than using a cell phone to the ear. Are our cell phones killing us?   Would we give them up if they were?