To block a number on a Samsung Android phone, open the Contacts app, select the contact, tap More, choose Block contact, and confirm. Alternatively, in the Phone app, copy the number, tap More, select Settings, tap Block numbers, add the number, and tap the plus sign. To block a number from the Recents section, navigate to the number, tap Details, More Options, and Block number.
For Pixel phones or stock Android, open the Phone app, tap More, select Call history, choose the call, and tap Block/report spam.
To unblock a number on a Samsung device, open the Contacts app, select the contact, tap More options, and select Unblock contact. In the Phone app, tap More, select Settings, tap Block numbers, and tap the (-) next to the number. For Google Pixel and stock Android, open the Phone app, tap More, select Settings, tap Blocked numbers, and tap Clear (x) next to the number.
Calls made during the blocking period will not appear in call logs.