get injured, and with mountains surrounding you on all sides cell service is quite limited. we found a family on our trail through echo canyon miles from the trail they had been searching for. when asked if they had a trail map, their response was, no we forgot it.
#2 cell phone: bring it just in case you would need help and are lucky enough to get a signal.
#3 first aid: you don’t need much but you also should never be without some first aid items. we actually offered some of our first aid supplies to a family we met on the trail because they left theirs back in camp. you 