Not myself or family,BUT several years ago my fanily were hunting in a new area and a 10 year old kid walked up to me and asked if i had a cell phone as he had lost track of his Grandfather's tree stand was cold and wet so used the cell phone to call his father at home to come and get him.
Come to find out that his Grandfather had had a heart problem and if his father hadn't been called as he knew were the grandfathers tree stand was it could have been much worse for him.