What is the penalty for phone harassment charges?

Answer 1

The same as stalking depending which state, or
country you are in.................................................

Answer 2

The use of an electronic device to communicate a threat alone is a federal offense, the fact that they are service members merely compounds it. It depends however on where exactly they committed the offense on who will have the authority to effect the arrest. If they did it off base the military will defer to the civilian authorities......