No. Unblocking a number simply allows communication again. If you previously had them saved as a contact, they likely remained in your contacts list (though you may have deleted them). If you blocked a random number without saving it, unblocking them does not save them to your contacts; it just allows them to reach you.
If you prefer to stay within your text messages, you can unblock someone directly from your conversation thread. This is often the easiest method if you know you have an existing text thread with them. how to unblock contact in iphone
By following these steps, you can manage your privacy settings effectively and restore communication lines whenever you are ready. how to unblock contact in iphone