Open the Phone app
Tap Recent calls or Call history
Tap the number you want to block
Tap More options or the three dots
Select Block number or Block/report spam
Confirm the block
Open the Phone app
Tap the three dots
Tap Settings
Tap Blocked numbers
Tap Add a number
Enter the phone number
Tap Block
Open the Contacts app
Select the contact
Tap More options
Tap Block contact
Confirm the block
Open Messages
Open the conversation
Tap More options
Tap Block number
Confirm the block
Open Phone app settings
Turn on Caller ID and spam protection
Turn on Filter spam calls
Open the Phone app
Tap More options
Tap Settings
Tap Blocked numbers
Turn on Unknown or private numbers if available