You can easily unblock a number on your iPhone through the Settings app. This is the most comprehensive way, as it shows you all the numbers you've blocked, regardless of whether they're in your contacts or not.
To unblock a number on iPhone: Go to Settings > Phone > Blocked Contacts. Find the number you want to unblock, swipe left on it, and tap "Unblock." Alternatively, go to Settings > Messages > Blocked Contacts and follow the same steps. The number will be removed from your blocked list.
For unblock a number in iPhone just follow these simple steps : Go to Settings > Phone > Blocked Contacts. Find the number you want to unblock, swipe left on it, and tap "Unblock." Alternatively, go to Settings > Messages > Blocked Contacts and follow the same steps. The number will be removed from your blocked list.