You don’t own the shit as a kid.
If it was a gift, you do.
If you violated the agreement of “you can have a phone if you keep up your chores”, you cannot have your trust violated when you are the one that didn’t do the chores and lost the phone.
We don't know whether such an agreement was made.
And the agreement is you get a privilege if you keep up your end of the deal.
You think communication with the outside world is a privilege? I think it is a necessity.
If anything, the parent is showing that they were being honest and not lying to you, because they’re doing exactly what they said they would.
Did you forget the specific scenario we are talking about?
Regardless of what I think, the law typically does permit parents to limit access to cars, computers, phones, and more. But in the case of the post we're responding to, the phone was taken without her knowledge or consent, causing needless distress.