There is a short message in our school that will send my grades to my dad's mobile phone every month. Texting is ten yuan a month. How can I cancel it? Urgent! It must carry weight.

~ I just secretly turned off my mother's cell phone, too. You took your father's mobile phone and called the customer service number 10086 (mobile phone), then you asked them what service they had, and then you asked them to turn off the school newsletter.