my mom wont let me have my cell on school days?

k. so im getting a new phone...FINALLY!! im tutoring my brother 5 days a week for 2 hrs a día at $5/hr. thats $50 a week, so in about 2-3 weeks ill have my new phone. im really responsible and i have had straight a's all año this año (i was in 6th grade, now going to 7th, im 12) ive never had an average percentage lower than a 97. im going to be in algebra 1 in 7th grade, and im in the 99 percentile for both lectura and math eogs. siguiente año ill be raking in high school credit already. im really basically, a 'genius' as my friends and family call me, responsible, obedient, sweet, voted most likely to become president. i was accepted into this national junior honor society leaders camp when i was 8. i deserved my phone! with unlimited texting!

but, my mom says i can use my phone all summer whenever i want and on weekends during the school year, but she dicho im not allowed to take my phone to school and im not allowed to use it on weekdays! i really seriously dont know why. we discussed it and i assured her i wouldnt be texting during school, and she dicho she didnt care. i told her i wouldnt lose my phone at school either. she told me she didnt want me distracted with a phone and texting on school days when im supposed to be doing homework. she also added that i already get to see my friends at school so theres no point of talking to them again afterschool. but some of my friends wont be in my classes and some of them are moving away! so texting is my only option.

is there any way i can convince my mom to let me use my phone on school days and to let me bring it to school? (she gets pissed really easily)

thanks:)