Quote: I have to collect $$ from him to pay it on time, or he'll just let it slide.
So let it slide, let the phone get cut off...stop asking for the money from him, if the phone is disconnected that is HIS fault, and HIS responsibility to take care of it. DON'T ask for the money to pay for it if you're trying to get him to step up and take responsibility...by doing this you're playing mommy to him (and I don't say that to put you down k?)...you aren't making him be responsible; you're the one being responsible and he knows he can count on you to do that.
Taking control of your own actions (like asking for money to pay for luxury items that benefit him only) is your first step here. I know it's stressful to know the phone is in your name and will likely be disconnected, but if it is tell him that if he wants a cell phone then he needs to take care of that all on his own and be responsible for the bill...all on his own.....don't do it for him. It's a place to start COgal.
COgal...I notice you shoot down the majority of our suggestions. What are you willing to do? Do you do nothing out of fear that he'll be hurt/angry? If so, I understand that but I don't see how this will be resolved without confrontation. He's taking MAJOR advantage of you, he's not going to like it when you stop allowing that to happen.