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

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Samsung Galaxy J7 Duo (2018) Samsung Galaxy J7 Duo (2018)
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Samsung Galaxy J6 (2018) Samsung Galaxy J6 (2018)
Samsung Galaxy J4 (2018) Samsung Galaxy J4 (2018)
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Samsung Galaxy J7 Refine (2018) Samsung Galaxy J7 Refine (2018)
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Samsung Galaxy J7 V 2nd Gen Samsung Galaxy J7 V 2nd Gen
Samsung Galaxy Sol 3 Samsung Galaxy Sol 3