My first son is now 23, but there is a big gap between him and his sister (6 years) and little brother (6 more years). The boys had to share a room, which ruffled his feathers.
I made sure that he knew he was important, and I depended on him to do some manly things for me. LIft, carry, clean, etc. I tried to get him jobs that were with good male role models to not be the one telling him everything. He lost some jobs because of foolishness, oversleeping, etc., but those were lessons he needed to learn.
I woudl take away things that were easy on my, but treat him more like an adult doing it, for ex., say you can't be on the computer the rest of the day, the next week, etc. Not lock up the computer, but remind him if he "forgot", oh, you're off the computer, remember? And the clock started ticking again.
EAsy on me, hard on him was my motto. But tell him, show him, feed him, in every way you can that you appreciate him, that he IS a man and that you understand it's hard. One night (I would go in at bedtime and he would sometimes start to just talk and talk about legos, cars, whatever until my mind was spinning, my eyes wanted to close) one time I said "You know, I wouldn't be 13 again for a million dollars." He was shocked, because hollywood makes the teens such an idealized period. But those times helped him realize I really am there for him. May not be able to buy him everything he wants, cannot solve his problems, but solidly in his corner.
Now he's 6'2, picks me up and says "you were the best mom". AT the time however, I was the evil mom homeschooling him and making him a geek.
S.
and what's wrong with taking away his cell phone? if it hurts, do it.