How to block, mark as spam, or unblock phone numbers on Samsung devices

Samsung Galaxy C7 (2017) Samsung Galaxy C7 (2017)
Samsung Galaxy Note8 Samsung Galaxy Note8
Samsung Galaxy S8 Active Samsung Galaxy S8 Active
Samsung Galaxy J7 V Samsung Galaxy J7 V
Samsung Galaxy Note FE Samsung Galaxy Note FE
Samsung Galaxy Xcover 4 Samsung Galaxy Xcover 4
Samsung Galaxy C5 Pro Samsung Galaxy C5 Pro
Samsung Galaxy S8+ Samsung Galaxy S8+
Samsung Galaxy S8 Samsung Galaxy S8
Samsung Galaxy J3 (2017) Samsung Galaxy J3 (2017)
Samsung Galaxy J5 (2017) Samsung Galaxy J5 (2017)
Samsung Galaxy J7 (2017) Samsung Galaxy J7 (2017)
Samsung Galaxy J7 Pro Samsung Galaxy J7 Pro
Samsung Galaxy J7 Max Samsung Galaxy J7 Max