Your own cell phone?

I'm 12 / w and don't have my own cell phone… I have a laptop that I write on. I have internet access etc.
I use skype because there's no whatsapp.
I would really like to have my own cell phone because you can use it to take pictures, listen to music and use whatsapp.
I know that you are not allowed to use whatsapp at 12, but seriously, who does it? And even if I don't have a whatsapp, it's much smarter that I can take my cell phone with me.

Still, my parents won't allow me!

Maybe you can explain to me what difference it makes now, whether I use skype or whatsapp and just PC or mobile phone.

Do you have any tips or arguments for a cell phone?

Arguments: You can call the police / ambulance or your parents in an emergency.
In addition, you could write to your parents (when you are out) whether everything is okay.
In addition, a cell phone serves as a small computer with which you can google everything and do research on the go.