Kids don't call, they text. If you don't have texting on your cell phone and give them grief because it costs 20 cents when they text you, then you are in for a long wait for communication. Some parents are miffed because they want their kids to call once a week, twice a week, whatever, and talk for 20-30 minutes. If you start putting pressure on your SA kid like this, then guess what? They are going to find you as stressful as the academy is and you will get further and further apart as far as communication and your relationship. Better for you to text them a couple times a week and send a short supportive message, even just saying, "love you" or "proud of you" or "know life isn't easy right now, but you can get through it" or anything like that. They love you but they are busy/stressed/trying to build a life of their own.