Android has a built-in call blocker you can use right now

Open the Phone app on your Android device, find the number you want to block in your call history or contacts, and tap and hold it until a menu appears. Select "Block number" or "Block contact" — the exact wording depends on your phone's manufacturer and Android version. The call will be silenced immediately, and future calls from that number will go straight to voicemail without ringing your phone.

If you want to block a number before it calls you, open your Contacts app, find or create the contact, tap the three dots or menu icon, and look for "Block" or "Block number". Some Android phones also let you block numbers directly from the Phone app's settings: open Phone, go to Settings, then Block numbers or Spam, and add the number manually.

Blocked calls still reach your voicemail, so the caller won't know they're blocked — they'll just hear your voicemail greeting as usual. You can see a list of all blocked numbers in your Phone app settings under "Blocked numbers" or "Spam and abuse".

Key Takeaways

  • The Phone app's built-in blocker works on all Android devices and blocks calls instantly without the caller knowing.
  • You can block a number from your call history, contacts list, or by entering it manually in Phone settings.
  • Blocked calls go to voicemail, so the caller hears your greeting instead of a rejection message.
  • Third-party apps like Google's Call Screen and carrier-specific tools offer extra features like spam detection and call recording.
  • Text messages from blocked numbers still come through on most Android phones unless you block the contact in your messaging app separately.

Where to find your blocked numbers list

On most Android phones, open the Phone app and tap the three-line menu icon (hamburger menu) in the top left or right corner. Look for "Settings" or "Call settings", then find "Blocked numbers", "Block list", or "Spam and abuse". The exact location varies by manufacturer — Samsung phones often label it "Block numbers", while Google Pixel phones call it "Spam and abuse".

Once you're in the blocked numbers section, you'll see a list of every number you've blocked. You can unblock any number by tapping it and selecting "Unblock". If you don't see a blocked numbers section in your Phone app settings, your phone may use a different system — check your carrier's website or your phone manufacturer's support page for your specific model.

Using Google's Call Screen for spam detection

If you have a Google Pixel phone or use Google's Phone app, you can turn on Call Screen, which automatically screens unknown calls and shows you a transcript of what the caller says. Open the Phone app, go to Settings, tap "Call Screen", and toggle it on. When an unknown number calls, Call Screen will answer and ask the caller to state their purpose, then show you the transcript before you decide whether to pick up.

Call Screen doesn't block numbers — it screens them first. You can block a number after seeing the transcript, or you can let the call go through if you recognize the caller. This is useful for filtering spam and robocalls without missing legitimate calls from businesses or people you don't have saved in your contacts.

Blocking calls through your carrier

Your phone carrier — Verizon, AT&T, T-Mobile, or another provider — may offer its own call-blocking service. Verizon offers Call Filter (free basic version, paid premium version with more features), AT&T offers Call Protect, and T-Mobile offers Scam Shield. These services block known spam and robocalls automatically and let you block individual numbers as well.

To set up carrier call blocking, contact your carrier directly or look for their app in the Google Play Store. Some carriers activate basic blocking automatically, while others require you to turn it on in your account settings or through their app. Carrier-based blocking works at the network level, so it can block calls before they reach your phone — useful if you want to prevent blocked numbers from reaching your voicemail.

Third-party call-blocking apps and their trade-offs

Apps like Truecaller, RoboKiller, and Nomorobo offer call blocking plus extra features like spam detection, call recording, and caller ID for unknown numbers. These apps require permission to access your call history and contacts, and some require a subscription for full features. Before installing any third-party app, check the permissions it requests — call-blocking apps need access to your phone calls and contacts to work, but they shouldn't need access to your photos, location, or other sensitive data.

The trade-off with third-party apps is that they collect data about the calls you make and receive in order to build their spam databases. If you're concerned about privacy, the built-in Android blocker or your carrier's service is safer because it doesn't send your call data to a third party. If you want advanced features like spam detection or call recording, a third-party app may be worth the privacy trade-off — just read the privacy policy first.

Blocking text messages from the same number

Blocking a contact in the Phone app does not automatically block text messages from that number. To block texts, open your Messages app (usually called Messages, Google Messages, or Samsung Messages), find the conversation with the number you want to block, tap and hold it, and select "Block" or "Block number". Some messaging apps require you to open the conversation, tap the contact name at the top, and look for a "Block" option in the contact details.

If you want to block both calls and texts from the same number, you'll need to block it in both the Phone app and the Messages app. Some Android phones let you block a contact in your Contacts app, which blocks both calls and texts at once — try opening Contacts, finding the number, tapping the menu icon, and selecting "Block contact".

What happens when you block a number

When you block a number on Android, the caller's call goes straight to your voicemail without your phone ringing or showing a notification. The caller hears your voicemail greeting and can leave a message, but they won't know they've been blocked — they'll assume you didn't answer. You won't see a missed call notification, but the blocked call may appear in your call history marked as "Blocked" or in a separate blocked calls log, depending on your phone.

The blocked caller cannot reach you by phone, but they can still text you (unless you block them in your Messages app separately) and contact you through other apps like email or social media. If you want to completely prevent contact, you'll need to block them in each app or service separately.

Frequently Asked Questions

Can someone tell if I blocked them on Android?

No. When you block a number, the call goes to voicemail, so the caller hears your greeting and thinks you didn't answer. They won't receive a message saying they're blocked. However, if they call repeatedly and always reach voicemail, they may suspect you've blocked them.

Do blocked calls still show up in my call history?

It depends on your phone. Some Android phones show blocked calls in a separate "Blocked" section of your call history, while others hide them completely. Check your Phone app settings under "Blocked numbers" or "Call history" to see where blocked calls appear on your device.

What if I block a number by mistake?

Open your Phone app, go to Settings, find "Blocked numbers" or "Block list", find the number you want to unblock, and tap it. Select "Unblock" and the number will be able to call you again. You can unblock a number at any time.

Will blocking a number stop them from texting me?

No. Blocking a number in the Phone app only blocks calls. Text messages from that number will still come through. To block texts, you need to block the number in your Messages app separately, or block the contact in your Contacts app if your phone supports that option.

Is it better to use the built-in blocker or a third-party app?

The built-in blocker is simpler and doesn't share your call data with anyone. Third-party apps offer more features like spam detection and call recording, but they collect information about your calls. Choose the built-in blocker if you want privacy and simplicity, or a third-party app if you need advanced features.