There are a million reasons why he is calling less.   Being deployed involves planning and requires a great deal of preparation to insure that each soldier will have a working system in place for him to be able to contact his family back home. Every aspect of deployment requires great attention to the details.  There are wonderful web sites for families of soldiers who are being deployed, or who are already deployed, as well as sites for soldiers loved ones to get support and coping skills for while they are away.  My favorite is the one for families of sailors on submarines but there are many others.  These sites inform people of all kinds of calling plans to make sure that you keep in touch from miles away, as well as, explaining how to write on going letters (daily journals etc) to keep the mail flowing to your soldier while he is far from home.  The coping skills involve eating chocolate, staying busy and there are so many tips to help you both.   Please check them out, and when in doubt, keep reaching out for answers.