I agree! My three kids are in sports and activities All Year Long, and even at 13 and in 8th grade, there has not been one time EVER where the adult in charge of the event/sport/activity has left my child high and dry in an emergency - or at all, for that matter. That is way to much liability. I remember back in the day when I was in sports and activities, the teachers and adults would all just leave and if my parent was late, I sat there by myself. And that was WAYYYY before cell phones and I lived to tell the tale.
And, further, my kids' major sport is football and cheerleading. NO football player or cheerleader brings their cell phone to practice. There isn't anywhere to put it! Obviously they cannot put it in their pocket, and no parent in their right mind would think that it is OK for a 1st-8th grader to set their phone down on the side of the field during practice. Anytime there is lightning or anything that cancels practice halfway through, the coaches bring out their cell phones and pass them around to the kids while they are waiting in the field house during the storm. PLUS, common sense would tell a parent not to go far when there is the possibility of bad weather when your kid is practicing on an open field with no shelter!
So, the "my 7 year old needs a phone so they can reach me at all times" has always stumped me, but honestly after that? I don't really care what other parents do....if they want to spend hundreds of $$ a year on cell phones and cell bills, who am I to try to stop them??!!