As many have stated, statics show that more hunters are injured from falling each year than any other hunting injury. Studies show that unless you are wearing a full body harness (correctly) you stand a high chance of severe injury if you fall. Further more, if you wear a half harness (like me) or worst just a belt you may only have seconds before you run out of air. With that said, the phone is good, if you have a signal and can call someone that can get to you within time. Many use radios but thats only good if you have a partner near by and if you can reach it while hanging there. Many including myself wear a knife on their belt just in case they have to choose plan "B". However, there is one additional safety precaution that is cheap, doesn't take up any room and would always be there. A Whistle. I have been thinking about this and discussed it with a hunting partner during a recent trip to the mts. I have a small flat plastic whistle that I have always carried in my pack but decided to recently move it to my harness. It is small (2 inches long) flat, weights nothing but can easily make a lot of noise. I'm thinking if I heard a whistle blowing I would surely go look? It would really suck to fall and be hanging there (dying) only to learn that someone was hunting on the very next ridge but couldn't hear you yelling. I think I will be picking up whistles for all the guys I hunt with. You can tie/tape them on the front of your harness and it will always be there should the need arise. If any of you are hunting and hear a whistle blowing real loud please come look.