So from what I've seen/experienced, a beacon in search mode will only act sporadically when within about foot of a cell phone. So, if you're buried less than a foot under with your cell phone on, when your buddy is doing the fine search, it will give him fits. But, if your beacon and phone are on your torso and it's buried only a foot under, odds are one of your limbs will be sticking out. So that means that your life isn't at risk if you have your phone on. But if I have my phone on and say, in my chest pocket, it sure as heck puts it close enough to mess with my beacon as I search for you. Your buddies are the ones who are at risk if you have your phone on.