you know...my children's father does this too. and i have never stopped him from calling his kids everyday. what i have noticed is that children are more likely to forget such silly conversations more readily then you think. use that to your advantage. plan to do something constructive after each phone call. my kids pretty much talk to their dad right before playing outside with friends or right before watching their nightly tv program before bed. all negative thoughts are out the window in a few minutes. don't listen in on phone calls. your child will remember that. deliberately be unavailable while your child is having a conversation.