Answer:
Convincing your parents does not require a very large survey. I mean if they are to be convinced, they can get convinced by you only and if not, then 20 people also can't convince them.
So, if you are willing to convince them, gather few people whom they trust and who can vouch for you. If they can convince your parents on your behalf then you can get a phone.
Secondly, having a cell phone depends on your age. If you know the pros and cons of keeping a phone and social media, they can agree.
If you are a small kid like 8 or 10 years, then you are vulnerable to online hacking or cheating.
Using a phone in today's time is a responsibility as you will be exposed to all sorts of social media, that will affect your studies as well.
Hence, if i were a kid, my parents would never give me a cell phone.