I'm 18, I live with my mom; can she still go through my phone?

We qualify for free phones, so nobody is really "paying" a bill. I feel really weird knowing that I'm legally an adult and my mother still feels the need to monitor my phone. I have a boyfriend, and I don't want her intercepting things from him, and I have stuff I wouldn't really want her to see. I feel like, I'm an adult and I shouldn't have to clear my search history for my moms regular phone checks. When I try to talk she says "you're my child, under my roof, if you don't like it, leave". Which I am in 3 months. I just wanted to get an outside opinion since it is a little late to actually do anything. 💕💕 *Can I keep the same phone, but just put it on my own plan?

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