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

Apple iPhone 12 Pro Max Apple iPhone 12 Pro Max
Apple iPhone SE (2020) Apple iPhone SE (2020)
Apple iPhone 11 Apple iPhone 11
Apple iPhone 11 Pro Apple iPhone 11 Pro
Apple iPhone 11 Pro Max Apple iPhone 11 Pro Max
Apple iPhone XS Apple iPhone XS
Apple iPhone XS Max Apple iPhone XS Max
Apple iPhone XR Apple iPhone XR
Apple iPhone X Apple iPhone X
Apple iPhone 8 Plus Apple iPhone 8 Plus
Apple iPhone 8 Apple iPhone 8
Apple iPhone 6 Apple iPhone 6
Apple iPhone 6 Plus Apple iPhone 6 Plus
Apple iPhone 6s Apple iPhone 6s
Apple iPhone 6s Plus Apple iPhone 6s Plus
Apple iPhone SE Apple iPhone SE
Apple iPhone 7 Apple iPhone 7
Apple iPhone 7 Plus Apple iPhone 7 Plus