Advice on moving towards more open adoption

The reason for the prepaid phone in the beginning was more not knowing them yet really and my husbands issues. I'm with you. I don't see any reason she shouldn't just have my regular number. I'm trying to get him to be more open. He tends to be very private - too private in my opinion. It's just a comfort level for him. Right now he doesn't want to move towards more openness, I do. I'm looking for assistance helping him move that way.