How to Block Calls Not in Contacts on Samsung Galaxy

Samsung Galaxy phones offer several call-protection settings, but their names and behavior vary by model, carrier, country, and One UI version. Here is how to find the right option—and what to use when your phone only blocks private numbers.

Start with Samsung's Phone app. On current supported models, Samsung documents a Block calls from unknown numbers switch that can cover numbers not saved in contacts or identified by Smart Call. On other Galaxy versions, a similarly named option may focus on hidden or private caller ID instead. Test the setting with an unsaved number before assuming it blocks every non-contact.

Try Samsung's built-in setting first

1. Open the Phone app.
2. Tap More options (three dots), then Settings.
3. Open Block numbers.
4. Turn on the option for unknown numbers, if your model provides it.
5. Call the phone from a visible number that is not saved in Contacts and confirm the result.

Samsung notes that the feature is not available on every model, and Smart Call availability can also depend on the carrier. Menu wording can therefore differ even between two Galaxy phones.

Turn on Smart Call for known spam

Where supported, go to Phone → Settings → Caller ID and spam protection. Smart Call can label suspected spam and fraud, and some versions let you block all identified spam or only high-risk scams. This is database-based protection: it targets numbers Samsung's service recognizes, not necessarily every unsaved number.

If unsaved numbers still ring

If your Galaxy only blocks hidden/private calls, or the built-in switch is missing, use Android's call-screening role. Block Unknown Callers applies one local rule: numbers not saved in Contacts can be blocked or silenced. It requires no account and does not request Contacts permission.

1. Install Block Unknown Callers.
2. Accept Android's prompt to make it the call-screening app.
3. Select Block to reject non-contacts or Silence to mute them.
4. Test with an unsaved number.

Keep delivery, clinic, and work calls reachable

• Save a known number to Contacts.
• Add an exact number to the app's allow list.
• Enable repeat-call bypass for urgent callers who call again.
• Pause filtering while waiting for an important unknown call.
• Use Silence mode when you want a quiet phone but still want the call to reach the normal call log.

For the terminology behind these settings, see unknown numbers versus numbers not in Contacts.

Official sources

• Samsung: Block spam calls with Smart Call
• Samsung Smart Call
• Google Phone: block or unblock a number

Frequently asked questions