How to unblock a number on iPhone 4?

I blocked my friend on my last phone but now I want to unblock him. When I tried texting him it said The recipient you are sending to is in your block list. You have chosen to block all texts from (and to) this recipient. Msg 2134. The iPhone 4 doesn't have message options

IChat > Preferences > Accounts > Security click,"Allow people in my Buddy List" or "Allow anyone", depending on which you prefer, to unblock your friend.

Simple iChat > Preferences > Accounts > Security click,"Allow people in my Buddy List" or "Allow anyone"

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