You have certain legal rights, but there is little that can be done unless you make up your mind to do so.

You are allowed to go and live and work where ever you please. You do not need your parents permission. Nor do you need their permission to own a cell phone, or date who you see fit.

If you are relying on your parents for financial support they will be able to exert control over you. For example they do not legally have to give you privacy if you are residing in their home, or allow you to keep a phone that they are paying for. This is not illegal or anything that the police or the courts can do to assist. It is just the reality. if you choose to reside in their home, they can try to influence your decisions such as who you will date, even if this causes stress to you and effects your health, this is not illegal or something that they could face criminal charges or police intervention over.

If you want to be free of the interference of your parents in your life,, your first step would be to move out from their home. If you are not living with them, they have no ability, or legal right, to try to dictate any aspect of your life, be it your relationships, your possessions, or so on. If they are contacting you at. That time and this is unwanted, the you could make a police complaint or start a civil law suit about harassment. But that is not possible while you choose to reside as a guest in their home.