It depends on how the number was blocked. For example, if you blocked the number from the missed call or an SMS message, then you can go into your Phone app and hit the 3 dots in the top right. From here select Settings and Blocked Numbers and you can remove the block from any desired number or see what numbers have been blocked since you first got your phone.
If the number was blocked through the carrier, then your carrier would be the only ones to remove the block.
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