I want to grab a girl's phone and throw it as far as I can
Why would you throw her phone?
She never shuts up.
While some people may seem more talkative than others, taking their property and damaging it is never appropriate. Instead, if she's talking to you too much, ask her for a break. Being honest with someone rather than violent is always a better solution.
Fine, but I bet she never sees me as a threat.
It's fine that she doesn't see you as a threat. I'm glad you have agreed not to throw her phone though.