Can I Block Someone from Texting me on my iPhone 4?

When I finally got to college, I thought I was free from my horrible life, but now my mom keeps sending me evil, passive aggressive text messages. Is there any way I can block people from texting me without just throwing my phone in the toilet? Thanks.

Theres an app called iblock I believe. But there's not a way to block someone from the actually phone. That's the one thing that I don't like about iPhones