Android has a built-in call-blocking feature that works without installing anything extra

Open the Phone app on your Android device. When you see a call you want to block, press and hold the number in your recent calls list or contacts. A menu will appear with the option "Block number" — tap it. That number will no longer ring through to you, and calls from it will go straight to voicemail without your phone alerting you.

If you want to block a number before it calls you, open your Contacts app, find the person or number, tap the three dots next to their name, and select "Block number." The exact wording varies slightly between Android versions and phone manufacturers, but the option is always in the contact details menu.

Blocked calls still go to voicemail, and you can still see them in your call log if you look — they just don't ring or notify you. You can unblock a number the same way: find it in your contacts or recent calls, hold or tap the menu, and choose "Unblock."

Key Takeaways

  • Android's built-in blocker is free and requires no app installation — access it by holding a number in your recent calls or contacts menu.
  • Blocked calls go to voicemail silently and don't trigger notifications, but you can still see them in your call log if you search for them.
  • Some phone makers like Samsung add extra blocking features in their own Phone app, including spam detection that flags likely spam before you block it.
  • Third-party apps like Google Phone, TrueCaller, and RoboKiller offer more aggressive filtering but require you to grant them permission to read your contacts and call logs.
  • If you block someone and they text you instead, you'll still receive those messages — blocking only stops calls and voicemails.

Where to find the block option in different Android versions

On Android 12 and newer, the Phone app's blocking feature is the most straightforward. Open Phone, go to your recent calls, press and hold the number you want to block, and tap "Block number." On Android 11 and earlier, the steps are nearly identical, though the menu layout may look slightly different depending on your phone manufacturer.

If you use a Samsung phone, you have an extra layer: Samsung's Phone app includes a spam filter that automatically flags calls from known spam numbers before you even have to block them manually. You can turn this on in the Phone app settings under "Spam protection" or "Call blocking." Google Pixel phones use Google's spam detection, which works similarly and shows a "Spam" label on incoming calls it thinks are unwanted.

The exact menu names vary — some phones say "Block number," others say "Add to block list," and some say "Block this caller." If you can't find the option in your Phone app, check your phone's Settings app under "Apps" or "Notifications," then look for "Phone" and tap "Permissions" to make sure call-blocking is turned on.

What happens when you block someone

When you block a number, that person's calls go directly to your voicemail without your phone ringing or showing a notification. They won't know they've been blocked — they'll just hear your voicemail greeting as if you didn't answer. If they leave a message, it goes into your voicemail inbox, but you won't get the usual notification that a new message arrived.

Text messages from a blocked number still come through. Blocking only affects calls and voicemails, not SMS or messaging apps like WhatsApp or Facebook Messenger. If you need to block someone's texts as well, you'll need to mute or block them in your messaging app separately.

You can see blocked calls in your call log by opening the Phone app and looking at your recent calls — they're still listed there, just marked as blocked. Some phones show a small "blocked" label next to them. If you change your mind, you can unblock the number at any time using the same menu where you blocked it.

Third-party apps for more aggressive blocking

If the built-in blocker isn't catching enough spam or unwanted calls, you can install a third-party app. Google Phone (available on most Android devices through the Google Play Store) uses Google's spam database and flags likely spam calls before they reach you. TrueCaller maintains a crowdsourced list of spam numbers and can block calls automatically based on that list. RoboKiller uses artificial intelligence to identify robocalls and spam patterns.

These apps require more permissions than the built-in blocker — they need access to your contacts, call logs, and sometimes your location — so they can identify spam more accurately. Before installing any of them, read what permissions they're asking for and decide whether you're comfortable granting them. You can revoke these permissions later in your phone's Settings under "Apps" and "Permissions."

Most third-party blockers are free but offer paid versions with extra features like call recording or detailed spam reports. The free versions usually block calls just as effectively as the paid ones. You only need one blocking app installed at a time — running multiple blockers can slow your phone down and cause conflicts.

How to block calls from unknown numbers or private callers

If you're getting calls from numbers that show up as "Unknown" or "Private," blocking individual numbers won't help because each call comes from a different source. Instead, you can turn on "Block Unknown Callers" in your Phone app settings. On most Android phones, open the Phone app, tap the three dots in the top right, go to Settings, and look for "Block Unknown Callers" or "Block Spam." Turn it on.

When this setting is on, calls from numbers not in your contacts go straight to voicemail. This is aggressive — you might miss calls from doctors' offices, delivery services, or other legitimate businesses that call from private numbers. If you turn it on, check your voicemail regularly so you don't miss important messages.

An alternative is to use a third-party app like TrueCaller, which can identify many private or spoofed numbers and label them as spam before blocking them. This catches more spam than the built-in unknown caller blocker but still lets some legitimate calls through.

What to do if someone keeps calling after you've blocked them

If someone is harassing you and keeps calling from different numbers after you block them, blocking each number individually becomes impractical. Document the calls — take screenshots of your call log showing the dates, times, and numbers — and consider reporting the harassment to your phone carrier or local police.

Your phone carrier (Verizon, AT&T, T-Mobile, etc.) has tools to block patterns of calls from the same person using different numbers. Call their customer service line and explain the situation. They can sometimes block calls based on the caller's identity rather than just the phone number.

If the harassment is severe or threatening, contact your local police department and file a report. Keep records of every call, voicemail, and message. Many jurisdictions have laws against harassment by phone, and police can pursue the caller if there's a pattern of unwanted contact.

Frequently Asked Questions

Can someone tell if I've blocked them?

No. When you block someone, their calls go to your voicemail just like a normal unanswered call. They hear your voicemail greeting and can leave a message. There's no notification that tells them they've been blocked. They might suspect it if you never respond to their calls or texts, but the phone system itself doesn't alert them.

If I block someone, can they still text me?

Yes. Blocking only stops calls and voicemails. Text messages, emails, and messages through apps like WhatsApp or Instagram will still reach you. If you need to block their texts too, you'll need to mute or block them in your messaging app separately.

What's the difference between blocking and muting a contact?

Muting silences notifications from a contact but you still receive their calls and messages — they just don't ring or alert you. Blocking stops calls and voicemails entirely. Muting is useful for contacts you don't want to hear from right now but might want to hear from later. Blocking is for numbers you never want to hear from.

Can I block calls from a specific area code?

The built-in Android blocker doesn't have this feature. You'd need a third-party app like TrueCaller or RoboKiller, which can block entire area codes or number patterns. Keep in mind that blocking a whole area code might also block legitimate calls from that region.

Will blocked calls still show up in my phone bill?

Blocked calls don't appear on your bill because they're handled by your phone, not your carrier. Your carrier's records won't show them. If you need documentation of harassment for legal reasons, your phone's call log is your best record — take screenshots of blocked calls with dates and times.