As R and an occassional but rare BJ, I use a neck lanyard whistle. Never really liked the idea of a finger whistle, but the last couple of weeks, I've had to get on my whistle when it was out of my mouth and I couldn't find it.
For those that use the fingers, do you quickly put it in your pocket when you need to use the hand it is on? Or do you just leave it there while doing things like ball exchange? Does it stay on in that situation? Do you drop it often, just sometimes, not at all, or not much after some practice?
Just curious.