I need help.

A "friend" from school now has my iPhone number. He has been spamming me pure gibberish texts, and it is costing me money. He's also been sending me inappropriate stuff. The following are examples:
"Shut up before I come to your house at waipahu street and knock you out"
"Faggot"
"Your girlfriend is going to cheet with you after she finds out ur dickless"
"Go cry to your little gay ass boyfriend you ugly fucking loner."

These spam and harrassment messages have gone too far. I am so angry I want to murder this kid. Someone help me please.

 

You can block users who text you.
I believe in the contact options section, there is an option for blocking a user.
That should take care of it.

 

I only have an iPhone 4S.

 

Even an iphone 4S can do it, so long as you have updated it to iOS 7.

 

That's why. I guess I'll update.