Sad Dad...are the calls costing you? I wouldn't take them if they are. Being in a situation where he has to make pay calls is one of HIS consequences, not yours.
I recall times when my daughter was in jail. I relax for a while knowing she's alive and safe. Being released from jail means more of the same.
I recall someone saying "don't cut yourself on the broken pieces of their lives." I thought that's good advice.