How to Block and Unblock numbers from calling on my Galaxy Device?
How to block and unblock via Phone Settings
Note: You can also navigate to the Recents section in the Phone app, and touch the phone number you want to block. Touch Details > More Options > Block number.
How to Block Numbers from the Contacts App
How to Unblock Numbers or Contacts
Two ways on how to unblock phone numbers or contacts.
Open the Contacts app, and then touch the contact you wish to unblock. Tap More Options, and then tap Unblock contact.
Or, navigate to and open the Phone app. Tap More Options and then tap Settings. Tap Block number and then tap the Remove icon to remove the corresponding phone number from your block list.