How to block a certain number on iPhone from texting me? Jailbroken or not?

What's the app I need to get if it needs to get jailbroken if I can't do it without jailbreaking it?

There's no official way of doing this, However if you have a jailbroken device you can download iBlacklist from cydia. I believe iBlacklist is hosted on the bigboss repo,

Compatible with iOS 4, 5 and 6

iBlacklist is the best firewall for iMessages, calls, facetime, SMS and MMS available for the iDevices.

Now it blocks also FaceTime/iMessages and runs on iPod 4 and iPad 2.It ables you to select from who you want to receive calls and hide messages. It also removes the sms popup preview protecting your privacy, has parental control mode by blocking outgoing calls, can be fully scheduled and many other features

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