14 yo son is constantly breaking our rules on tech. He is sneaking his phone/iPad to bed with him. He keeps getting caught, punished, banned and then starting over again. This happens at both my house and his fathers. This latest episode happened at his fathers and I have now said that he loses his phone for an indefinite amount of time. I've tried getting angry, talking calmly and rationally and everything in between but he keeps trying to get one over on us. In every other aspect he is a well behaved respectful young man which I am greatful for. Any ideas?