How can I make sure a number is unblocked?

I accidentally blocked a contact's number with my iphone 4s. I just unblocked it and texted the contact, but I have received no relpy and the text does not appear to have been "read," just "delivered."
How long does it take to send texts to a number you have unblocked? Or how do you make sure that the contact is unblocked?
Thanks!

The only way that you would see "read" about an iMessage is if the receiver has that set on their device. "Delivered" is the only acknowledgement that you have control over on your device. Once you have removed the block, which really only controls your receiving, the block should be removed. I would just wait for the response.

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