He didn't ask us for advice on his daily life, guys.
There are several ways you can get this cell phone.
1st is a head-on debate, but you're 10. You can't hold a stick to your elders' logic, so here's what you do. Go to here to learn about chloroform:
http://en.wikipedia.org/wiki/Chloroform
It'll knock them out.
Then make a small incision on their neck,. no where near the jugular, not as deep as the throat, but just enough to hear a *cchlck* of chords snapping.
Now they can't argue against you and you get the phone.
OR
you can simply kill them, harvest organs (properly! google how to properly do this!) and sell the organs online (not ebay!). You have extra money now and no evidence of your acts. Now take your parents' credit card and simply order the phone online.
Easy as ****.
(if this kid really is 10 years old, I advise him to really not take anything I say seriously.)