maybe you should get a job, I know it sound's weird but think about it, your parents will think of you as more responsible, and you can start saving up for a phone, if you buy it with your own money, they can't really take it legally considering that you are now considered an adult (if you live in the U.S.). From what you said it seems like your still in high school, so also try and focus on maintaining a high GPA and doing well on the SAT if you have not taken it already, to get into college, once you're in college you don't have to see your parents unless you want to.
it's weird to do that but what if they're hiding something from you and u will find out so they take your chrome and u don't have a phone or they don't want u to move out cause people are probably going to find u and do something but what if this is true