In the meantime, be sure that phone is off and put away when it is supposed to be. Don't give your parents a reason to go off on you.
Let me swim against the grain for one second here.
If you have been asked over and over and over again to turn off your phone, and you sneak into your room to use it, you are breaking a house rule and you will be punished for it as parents do.
Is the punishment extreme?
Well , as others have said, if it is leaving bruises, yes. Period. end of story.
Speaking from a spanked child point of view..
I only got spanked when I did not listen to my mother tell me what I needed to do. She would tell me something over, and over and over for DAYS before she would result to a spanking. As an adult NOW, with a child, I understand her.
She was not abusive , -I was a stubborn little ****-.
I was rude, I was out of line, I was disrespectful and my mother gave me every opportunity to behave as i should before she resorted to strong arm behavior.
We are only hearing part of the issue and I do believe that what is happening to you is abuse..... but I have to be devils advocate for a second and bring up that , it does not matter if you are an A student or not. You have to follow the rules.
If that rule is turn off the phone? You better do it.
Since your parents are paying that bill, they have a right to claim that phone. Sorry. If -you- are paying that bill? Then they owe you money for breaking it.
Go to your school. Show them your bruises. Speak up about what is happening. NO child should ever be physically hurt for something as stupid as using a cell phone.
Speak up. Now.