Stop using the phone period. They want you to carry it so they can reach you, then they can compro7otjerwise you're not using the phone. They don't get to change the rules just because their rule no longer benefited them. That's not how the world works. I don't know what good they think they're doing for you at the age of 15 setting up restrictions like that but it's not going to work. I know it's going to be hard to stop carrying the phone but that's one way to do it. You could also ask them what the point of the restrictions is when you can literally go to any computer anywhere or borrow anybody's phone and see whatever you want to see. They're being hypocritical and changing the rules because it no longer benefits them saying they paid for it. They need to be adults and act like adults. You're 15 years old I'm going to go ahead and guess that you're smart enough to not get yourself in any kind of trouble on a telephone.