Turning him on

I need help, I am in a long distance relationship and its not easy for us to be intimate with each so we tried phone sex and skype but he's not into it. I tried sending him sexy pictures and videos but nothing he just says "Awww how cute" or "you look adorable " or a "ill talk to you later" some times nothing at all.... Can you please tell what im doing wrong here? How do I get him turned on?