C.L.
The way things work with teens is that "they know everything". So, you should just ask her what kind of phones she has seen at school, what ones she likes, and which are the best. You can do it in general terms without giving away that she may get one. My daughters liked a bunch of phones for looks, etc., but were able to find out from their friends which phones worked the best, etc. Many phones look cool, but don't work so well under the constant use of kids, being shoved in pockets, and falling to the ground on a regular basis.