I used an InReach Mini 2 as a communication device for family at home as well as for an emergency SOS and GPS tracker on our trek in 2024. We did have a medical situation that took one of our Scouts off trail, but were able to use cell service to discuss a plan with the infirmary. We had cell signal on the top of the ridge at Upper Greenwood camp.
No concerns by our Ranger. I saw many of them on trail, mostly on the shoulder straps on Advisor packs, but I did notice multiple youth that had them, too.