Just caught up on your sitch....been taking a break from this crap for a while. So sorry to find out she actually moved out, well maybe not sorry maybe angry is better word. What drives them to be so fricken selfish.
I had a thought about the kids ... the seven year could handle a cel phone. I know mine does. I gave my seven year old my extra cel phone when he went on a sleep over. It was in case he got scared, he could call me anytime and he did.... I could tell he felt real good about having his dad with him in his pocket.... those pre-paid phone are pretty cheap this way he can call you anytime he wants and you call him direct. As far as the 3 year old, maybe the seven year old could pass the phone to say goodnight...that way you do not have to talk to her at all.