Open the Messages app
Open the conversation from the sender you want to block
Tap the contact name or number at the top
Tap Info
Tap Block this Caller
Tap Block Contact
Open the Settings app
Tap Messages
Tap Blocked Contacts
Tap Add New
Select the contact or enter the number you want to block
Open the Settings app
Tap Phone
Tap Blocked Contacts
Tap Add New
Select the contact or enter the number you want to block
Open the Settings app
Tap FaceTime
Tap Blocked Contacts
Tap Add New
Select the contact or enter the number you want to block
To unblock a number, open Settings
Tap Messages, Phone, or FaceTime
Tap Blocked Contacts
Swipe left on the contact
Tap Unblock