I disagree to some extent, When me and some of my hunting buddies get a chance to hunt together we have found it helpful using our phones to text message. One might have a different view of a field, swamp or woods and could let a buddy know to be on gaurd, get gun ready, rattle horns, grab grunt tube/doe bleet. It worked great for me last year. My buddy was sitting in an oak ridge to my west about 200 yards from me and spotted some does making there way down a fenceline to my east, I couldn't see them until they got about 50 yards to my east. I filled a doe tag that night.