Ways to find out who a phone number belongs to.

My husband and I are separated with an agreement on custody about him contacting prostitutes. We are currently living in the same house but leading separate lives. He lost his job but should find another one soon so I am trying to do my best for he sake of the kids. My biggest problem with my husbands serial cheating was all the escorts and sleezy prostitutes he was with over the course of many years. He used very poor judgement and I will argue for sole custody per our written agreement if he is contacting prostitutes. I do not want my children exposed to this element. My 12 year old son has the same model cell phone as my husband so when I picked up the wrong phone (thought it was my sons but it was my husbands) I saw an unfamiliar number. I no longer snoop but I had instant anxiety and I want to know who's number it is. We are not in R, so he has no reason to tell me and because he knows there is to be no prostitutes, he would lie anyway. I used all the reverse lookups I can find but it only tells me that it is a Verizon cell phone and the city where located. The city is where some of the old prostitutes are from but I could also be very paranoid and it could be anybody. I want to be in stealth mode to find out who he called but I can't think of a way to do this. I don't trust any friends to call for me right now. My anxiety is very high. Again, maybe for no reason. Maybe just a trigger. If I ask my lawyer, it will cost me. $$$ Any ideas?

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