What should i do plz tell!!!?

actually my parents dont allow me to take phone wid me ..and i cant talk to my gf ....... by i miss her..... Nd she always ignore me in school ..because she feels awkward when anyone tease her by my name .....she only tlk on phone ...and my mom does not allow me to take phone until i get more than 90 % in 10th boards ...what should i do guys ...!!!! i am depressed!