I want to know which is the best cellphone plan to get?

[idk]

I don't know much about cellphones Im 14 years old and my mom doesn't want do get me a phone because she thinks that it costs too much. What are same good plans and which is the best phone to get. I want to convince my mom it's not going to cost her that much. Also which phone do u have, ways your plan and how much do u pay a mounth? I want to have unlimited text