I'm thinking of taking my daughter's new phone. Think I should?
What makes you want to take your daughter's phone?
She never uses her phone and she's too careless of it.
I don't think you should take her phone since it's her property and not yours. You should just talk to her about how important it is to take care of such an expensive device.
I know what I'm doing, I'm doing it for my own good.
She needs that phone to contact you, her job if she has one, and other friends. You should find a more fitting punishment and don't take her belongings like that.