The cell phone bill could be a tricky situation. It will probably backfire on you if he has forgotten to pay it. My h is a good one for thinking that I "just know" everything. And then he gets aggrevated that I didn't share something with him. Example: H- "Honey, have you seen my boots?" Me-"no" H-"Are you sure? Or are you just trying to teach me a lesson?" Me- "I hereby swear on a stack of bibles that I have no earthy idea where your boots are."
Can you casually mention something about it? Maybe, "hey, do you need the checkbook to pay the cell bill?"