Never had them freeze up any worse than a goose call. I hunt in the snow quite often, and always just keep the lanyards n calls tucked inside my jacket. I carry several different calls when out so I`m usually gtg in that respect. But yes I have had them freeze on rare occasions. I also keep a couple diaphragm calls in my pocket. I get the elevation thing, but my house is at 3500 lol.
True story, I carry 3 or 4 all the time, pretty easy to put in the pocket inside the vest if I'm worried about warmth. I always carry at least one closed reed as well.
Also see E calls have issues as well a fair ways off from the truck and they're a heck of a lot more to tote than a mouth call.
One takes there pics and goes with it.
Best thing to a remote is sticking a robo bunny or something out there and having El Bun watch it instead of looking right at me...