How to unblock someone's number on my iphone 5?

I had someone blocked for awhile because we were fighting. Given time to calm down, we tried talking again. I unblocked him, but it won't let me send a message. I've tried everything, and now I don't know what to do. Using kik to talk to him is getting really annoying, so if anyone has any idea what I could possibly do, that would be great. We both have cincinnati bell, and he doesn't have me blocked on his phone.

Go to your Contacts-----Select the Person Name-----Scroll to the bottom there should be an option That say"Unblock Contact"

Try looking it up on google.