Howdy Buzz, thank you for inquiring about the Samsung Galaxy Note9. Yes, the Samsung Galaxy Note9 has a built-in call blocking feature. You can easily block specific phone numbers, contacts, or unknown callers directly through the native Phone app. Here's how to Block a Number - Open the Phone app. Tap the three dots (Menu/More options) in the top-right corner. Select Settings. Tap Block numbers. Enter the number manually or tap Recent/Contacts to pick a number. Tap the Plus (+) sign to add it to your block list. If you have any other questions for us, please feel free to reach out to Support. Thank you for being a loyal Samsung customer. - Debra