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Open your Android's Phone app . Tap the Call logs tab. Tap ⋮. Tap Call settings. Tap Reject call. Tap Blocked numbers. Tap +. Tap New number. Enter a number. Tap Done.
It's a phone-shaped app on the main screen, though you can find it in the App Drawer as well. You'll find this either at the top or at the bottom of the screen. It's in the top-right corner of the screen. Tapping it prompts a drop-down menu. You'll find this option in the drop-down menu. It's beneath the "GENERAL" heading. This option is near the top of the page. A window with blocking options will appear. Doing so opens a text field. You can also tap Contacts to select a number from your contacts, or Call logs to select a recent number. If you do this, the number will immediately be added to your block list. Tap the text field, then type in the number that you want to block. It's below the text field. Doing so will add the number to your phone's block list. You should no longer receive calls from the blocked number.