Well, ask him kindly, when he's in the best mood, if you can get a new cell phone. Then he'll probably ask what kind, then that's when you say Iphone. After that, he'll probably laugh, (or if he just says yes) but just in case he says no, try and reason with him like, i'll work for half of the money, or maybe a bribe like if you give me the Iphone, i'll make sure my room is clean everyday or something.