Grandfathered plan , can i get off my moms bill? lol

Alright guys its come that time in my life where my mom just NEEDS me to be off her phone bill lol She wants to change plans but i am STUCK i think. The deal is i have a GRANDFATHERED plan that some of you i know still have or have heard about and its unlimited DATA , can i still keep that and switch to my own plan just me?does anyone happen to know the answer to this? Imafraid any switch will make me lose this plan.