What should I do?

My daughters father and I were married for 9 years. We got a divorce little less than a year ago. He’s moved to another state and our daughter lives with me. Since he’s moved, he’s not called her but a few times on his own, without us calling or me asking him to call. He almost always never answers the phone when our daughter calls. It really upsets her to the point where she doesn’t want to cal him anymore b/c she knows he won’t answer. I’ve talked to him multiple times about this and told him how she told me she feels about it. He never says anything about it. Just tells me he’s dealing with life…I need advice on how to either get him to talk to her more or have her not be so upset about it.