unblocking a previously blocked phone number
how do i unblock a previously blocked phone number
how do i unblock a previously blocked phone number
It would be better if you can please post a screenshot, in order to understand the phenomenon better.
You may get better and prompt responses if you may kindly provide the iPhone Model that you have and the iOS version if it is known to you.
Settings > Phone > Call Blocking & Identification > Edit > tap "-" Remove the number from Blocked Contact list
See the pic below
unblocking a previously blocked phone number