Call & email from my old friend

At last night, My old friend called to me but I didn't notice the call of cellphone. When I noticed the call,it was 11 pm. I called back to him but I couldn't talk with him. Today I received a email from him. I send a email to him. He was a classmate when I was in the university. We had gone drinking & playing together. We went to Guam,Izu,Nagoya-city,Sendai,Miyagi. After I had graduated from the university,we sometimes met to go drinking & playing. But recently I didn't have chances to meet him.