How Can I Convince My Parents Into Letting Me Get A Cellphone?

Do you have a job to pay for the cell phone...if not then you shouldn't have one they are expensive, try getting a job or do chores for money to help pay for the cell, your parents are more than likely worried about the money side of having a cell, maybe make a deal with them about earning the money to pay for it....that might help

Well you could tell them that it would be easier if you were at your friends house you could get ahold of them better or you could say it would make you fill safer that way if you are being followed by someone you don't no and you think they are bad then you can call your parents to pick you up those are just some ideas

Say that sometimes it may be the only way for me to contact u.  Earlier this year there was a threat for a school shooting at my school and we were on lockdown and my parents only knew i was ok through the texts i was sending them

Show them that you are responsible enough to have one, sit down and discuss it with them