Casio

I am interested in the Casio Commando C771. Specs. say it has a 3.5 mm audio jack. I really like the headset with microphone that I have used for years on my Nokia 8537i to speak hands-free on the road and while at my desk. Will this same headset with a mike work on the C771 just by using a 3.5 mm male plug X 2.5 mm jack adapter to plug it into the Casio ???
Thanx a bunch. VGS