Messages

I have a dilemma my ex-husband and I have been separated for 3 years divorced for a year. We have a daughter together. I am currently petitioning for legal custody. He does not have my personal information that I am aware of. He currently communicates with her through my cellphone. It iritates me when he calls and I have to see his number or hear his voice. I do not want to deny my child access/relationship with her father but what other means can I suggest for communication that doesn't involve me having to be involved. My daughter is only 4-years-old