Android has a built-in call blocker you can turn on right now
Open your Phone app, tap the three dots in the top right corner, then go to Settings. Look for "Blocked numbers" or "Call blocking" — the exact name depends on your Android version and phone maker. Tap it, then tap the plus sign or "Add number" button. Type in the number you want to block, and it's done. Calls and texts from that number will go straight to your voicemail or disappear entirely, depending on your phone's settings.
If you want to block a number that just called you, open your call history, long-press the number, and select "Block" from the menu. This is faster than typing it in manually. You can see your list of blocked numbers anytime by going back to that same Settings screen.
The built-in blocker works for most people, but it only stops calls from numbers you add yourself. It won't catch spam or robocalls unless you block them one at a time after they call.
Key Takeaways
- Your Android phone has a free call blocker built in — find it in the Phone app settings under "Blocked numbers" or "Call blocking."
- You can block a number by typing it in manually or by long-pressing a recent call and selecting "Block" from the menu.
- Blocked calls usually go to voicemail, but some Android versions let you delete them instead so you never see them.
- Third-party apps like Google Phone, Truecaller, and RoboKiller can block spam and robocalls automatically, which the built-in blocker cannot do.
- Do not share your blocked numbers list with anyone — it's private to your phone and stored locally, not in the cloud.
How to block a specific person or business
The built-in blocker is best for blocking people you know — an ex, a telemarketer who keeps calling, a business that won't stop. Open your Phone app, tap the three dots, go to Settings, then "Blocked numbers." Tap the plus sign and enter the number exactly as it appears in your contacts or call history. Some phones let you also block by contact name instead of typing the number.
Once blocked, that number cannot reach you by call or text. The person will not get a notification that they're blocked — their call will just ring on their end and then go to your voicemail, or it will fail silently depending on your carrier. You can unblock the number anytime by going back to the blocked list and tapping the minus sign or delete button next to it.
Using a third-party app to catch spam and robocalls
The built-in blocker requires you to know the number before you block it. If you're getting calls from unknown numbers or spam, a third-party app works better because it can recognize patterns and block calls automatically. Google Phone (made by Google and built into many newer Android phones) has a spam detection feature that flags likely spam calls before they ring. Truecaller and RoboKiller are two other popular options that maintain databases of known spam numbers and block them for you.
These apps work by comparing incoming calls against lists of known spam numbers. They're not perfect — some spam still gets through, and occasionally a real call gets blocked by mistake — but they catch far more than you could block manually. Most of these apps are free, though some offer paid versions with extra features like call recording or advanced filtering.
To use one, read it from the Google Play Store, open it, and follow the setup steps. The app will ask permission to access your calls and contacts. You'll need to grant these permissions for it to work. Once set up, it runs in the background and blocks calls automatically without you having to do anything.
What happens to blocked calls and texts
When you block a number on Android, the behavior depends on your phone model and Android version. On most phones, blocked calls go straight to voicemail without ringing. The person calling will hear your voicemail greeting and can leave a message, but you won't be notified that they called. Blocked texts usually disappear — you won't see them in your message threads, though some phones let you view them in a separate "blocked messages" folder if you want to check later.
Some Android phones and carriers let you choose whether blocked calls go to voicemail or are rejected entirely. If you want to change this, go back to your blocked numbers list, tap the settings icon, and look for options like "Send to voicemail" or "Reject call." Not all phones have this option, so you may not see it.
Blocked numbers stay blocked until you unblock them. There's no time limit — a number you block today will still be blocked in six months unless you remove it from the list.
Blocking calls from unknown or private numbers
If you're getting calls from numbers that show up as "Unknown," "Private," or "Restricted," you cannot block them the normal way because there's no specific number to add to your blocked list. Instead, use your phone's "Block unknown callers" or "Block private numbers" setting. Open your Phone app, tap the three dots, go to Settings, and look for an option like "Block unknown callers" or "Block calls from unknown numbers." Toggle it on.
Turning this on will send all calls from hidden or private numbers straight to voicemail. This is useful if you're getting harassed by someone using a blocked caller ID, but it also means legitimate calls from some businesses and government offices may not reach you — many of these use private numbers. If you need to receive calls from your doctor's office or your bank, you may want to leave this setting off and instead block individual numbers as they call you.
Removing a number from your blocked list
If you blocked a number by mistake or want to unblock someone, the process is straightforward. Open your Phone app, tap the three dots, go to Settings, then "Blocked numbers." Find the number you want to unblock, tap it or the minus sign next to it, and confirm the removal. The number is now unblocked and can call or text you again.
Some phones show a list of blocked numbers with an X or delete icon next to each one. Tap that icon to unblock. If you're using a third-party app like Truecaller, the unblock process is similar — open the app, find the blocked list, and remove the number from there.
Privacy and security things to know
Your blocked numbers list stays on your phone only — it's not stored in your Google account or synced to the cloud. If you get a new Android phone, your blocked numbers won't transfer automatically. You'll need to add them again or export your blocked list if your phone has that feature. Check your Phone app settings to see if there's an option to export or back up your blocked numbers.
Do not share screenshots of your blocked numbers list with anyone, because it reveals which numbers you've blocked and why. If someone is harassing you and you're considering legal action, keep records of the calls and texts separately from your blocked list — screenshots of actual messages are more useful to police or a lawyer than a list of blocked numbers.
If you're using a third-party app like Truecaller or RoboKiller, read the privacy policy before installing it. These apps need access to your contacts and call history to work, and some of them use that data to improve their spam databases. You can usually control what data they collect in the app's privacy settings.
Frequently Asked Questions
Will someone know if I blocked them?
No. When you block someone, their calls go to your voicemail and they hear your greeting, so they won't know for certain that you blocked them — they'll just think you didn't answer. If they text you, the message disappears, so they won't get a delivery confirmation. However, if they try to call repeatedly and always get voicemail, they may suspect you blocked them.
Can I block calls from a specific area code?
The built-in Android blocker cannot block entire area codes — it only blocks individual numbers. If you're getting many calls from the same area code, use a third-party app like RoboKiller or Truecaller, which can block calls by pattern. Some of these apps let you block all calls from certain area codes or countries, though this feature is usually in the paid version.
What if I blocked someone and now I want to see their old messages?
On most Android phones, blocked text messages disappear from your main message thread, but some phones keep them in a separate "blocked messages" folder. Open your Messages app, tap the three dots, go to Settings, and look for "Blocked messages" or "Spam." If your phone has this folder, you can view old messages there. If not, they're permanently deleted from your view.
Do I need to pay for a call-blocking app?
No. Google Phone, Truecaller, and RoboKiller all have free versions that block spam automatically. The paid versions add features like call recording, advanced filtering, or priority support, but the free versions work well for most people. Your phone's built-in blocker is also completely free and works for blocking specific numbers you know.
Can I block calls while still receiving texts from the same number?
Most Android phones block both calls and texts from a number at the same time, and you cannot separate them. If you want to receive texts from someone but not calls, you'll need to use a third-party app or manually delete their texts without blocking the number. Some messaging apps like WhatsApp have their own mute and block features that work independently of your phone's call blocker.