How to block a person from texting me?

My grandmother keeps texting me messages (they are very rude, and I promise she is not ill. She is just being manipulative, so, I won't get into it). I want to stop receiving messages from her. Is there a way to block her number without jail breaking my phone? If not, how do I jailbreak it? I have an iPhone 4S and the provider is Verizon. Thanks!

Some phones have an option built in to block numbers but some do not. If yours doesnt you dont have to jailbreak it. All you have to do is take it to a verizon shop and ask them to block her number for you. I have AT&T and thats what i do, im sure verizon would do the same.

Simply follow the step so you can jailbreak your iPhone 4S.