Texts are not sending through?

As a joke, I was making prank calls using *67 a week ago, yesterday i synced my phone (iPhone 4s). Today, my messages seem to be sending to the middle of space since the person who is supposed to get them is not. I do not know what happened, but when i receive a text from this person 67 then their number appears, but my phone recognizes it as their contact. I do not know how to fix this and it is an important person to keep in contact with. Can someone Please give me a suggestion as to how to fix this Please AS SOON AS POSSIBLE

Have you tried rebooting your phone?

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