AGREED, there is a thousand uses for a cell phone on trail. Don't get me wrong, I agree with everyone about USING them on the trail, there is a difference. Your phone can also double as your GPS, your camera, your phone, your trail journal, use it for phone calls (business and pleasure, when noones around of coarse), etc. etc etc. I always bring my phone with me, it stays off and in my bag. If there is an emergency, I would feel like a complete tart for not having it with me because I wanted to 'maintain trail peace' or save 4oz. HYOH, thats all I have to say. Be respectful if you use them and for all of those who don't bring them, don't ask me for mine when you want to call the gear store to see what time they close, or call that little burger place 2 miles into town to see if you can make it in time for a hot juicy burger