Having a cell phone is not a false sense of security, it is a safety tool, no different than having gauze to pack a wound or a tourniquet to attempt to stop bleeding. No single one of these items are help you all the time,especially when you go into shock, and you will. But they are better than nothing, including an untrained 2nd person with you in the woods. If you sever a major artery, your outlook is very grim regardless of cell phone, emergency supplies, or a second person. I have a friend that faints at the sight of human blood, he can gut deer and elk all day and not blink and eye, but make that blood human, and his mind flips, and he goes down. He, unfortunately, would be useless as a second person to have in the woods when I'm cutting should something happen.