how can I make 20 dollars a month?

Sounds easy, right? Well guess what, nobody wants to hire a 14 year old with zero social skills. My stepdad has money, but my mom sucks him dry and I don't want to put any more pressure on him. I really really want a new phone, so I want the iPhone 6s, but I don't want to ask him to pay for it. I know that if I can come up with the monthly payments, then he will get it for me and pay for it through his account though. The only problem is, I don't know what to do to come up with the money every month. Do you guys have any suggestions?