How can I block calls from private caller?

Open the Phone app, and tap More > Call Settings > Call Rejection:Next, tap Auto reject list:Now, toggle the Unknown option On:N.B. If your Android smartphone does not include an option to block unknown numbers, you can also download and install call blocking apps such as Extreme Call Blocker or SMS and Call Blocker. read more

Private calls are those from people who want to block their numbers from appearing on caller ID screens. Bill collectors and telemarketers frequently call from private numbers. You can easily block a private caller. read more

Using popular services such as SpoofCard, private callers can choose what caller ID appears when they place an outbound call. For example, a caller could spoof their phone number to call from a phone number with a local area code or show their caller ID as “Private”. read more

Mobile service providers actually cannot block callers that come in with "Unknown" or "Blocked Number". I've tried (USA). Their solution (AT&T) is to give you a new phone number. They also offered I call the local police. They are only able to block calls with caller ID. read more