Can we take my stepson's stepfather to the court for this issue? Milletary Issues..Need your advice please..?

Does your custody order grant your husband phone access to the child? If so, they are in contempt of court, and this is a slam dunk. If not, then you need to get it amended so that it grants him phone access. And don't let the lawyer request 'reasonable' phone access, as that is a broad term that is totally unenforceable. Get something specific, such as up to 3 calls per week. The up to part is important. If the order reads 3 calls per week and your husband isn't able to get to a phone, which in his position is totally feasible, then she can file contempt of court charges against him. When you are dealing with an unreasonable ex, you need to prevent problems before they arise.