Hello and welcome to Android Forums. Hopefully I can help you with your problem.
It depends on how that person was originally blocked.
If you used an app to block the person then just go back into the app and remove that block.
If you have gone a step further and had your carrier block the person then you will have to contact the carrier and ask them to remove the block on the number.
If you have any other questions regarding your device, I invite you to join Android Forums. We have many sections for specific devices which contain a wealth of information.
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