Feeling homesick already!

Tomorrow, I have to join the military for a month. And now it is nearly 12 p.m in my country, I just can't sleep because plenty of things cross my mind all at once : What's the life like in the place that I'm going to? reach like?. How can I endure hard disciplines to overcome the final exam?, how bad will I miss my family?. It may be a probability that I won't be allowed to come back home after 4 weeks. Unfortunately, my mother's birthday is coming up. It stands to reason that I cannot take a chance to be with her, to tell her that i love her very much. Some wonder if I can talk to my mommy on the phone. It turns out that I can call her and hear her voice. Ridiculously, when I talk to her on the phone, she can't understand. What's wrong with my mobile phone????