Do data plan change after resetting it phone?

I recently erase all content and setting on my iPhone because the data wasn’t working right and wouldn’t let me connect to Wi-Fi. So I made it brand new and logged back in with my Apple ID. I jus have one question is that will I still have the unlimited data plan because I don’t know if I have it or not like before I resettled the phone it has unlimited data because I don’t want my parents to get mad but I just wanna know if the data plan is kept the same