Spam calls, robocalls, fake delivery calls, and suspected scam numbers can become annoying quickly. The good news is that many Android phones already include built-in tools to identify, filter, report, and block unwanted calls, so you may not need to install a third-party call-blocking app.
This guide explains how to block spam calls on Android, including Google Phone and Samsung Galaxy phones, how to block individual numbers, how to filter suspected spam automatically, and what to do when spam callers keep changing their numbers.
Quick Answer
On phones using the Google Phone app, open Phone > Settings > Caller ID & spam and enable the available caller ID and spam-filtering options. On Samsung Galaxy phones, open Phone > three-dot menu > Settings > Caller ID and spam protection, then enable Block spam and scam calls. Menu names and available features can vary by phone, carrier, and region.
How to Block Spam Calls With Google Phone
If your phone uses Google's Phone app, it may include built-in caller identification and spam protection.
- Open the Phone app.
- Tap the three-dot menu.
- Tap Settings.
- Look for Caller ID & spam or Spam and Call Screen.
- Enable See caller ID & spam if available.
- Enable Filter spam calls if the option appears on your device.
With spam identification enabled, the Phone app can warn you when an incoming number is suspected of being spam. Filtering options can also prevent certain suspected spam calls from disturbing you.
Google notes that available features vary by device and region. You can check the current instructions in Android's official guide to stopping spam calls on Android.
How to Block Spam Calls on Samsung Galaxy
Samsung Galaxy phones provide a built-in feature called Caller ID and spam protection, also associated with Samsung Smart Call.
- Open the Phone app.
- Tap the three vertical dots in the upper-right corner.
- Tap Settings.
- Turn on Caller ID and spam protection.
- Accept the terms if prompted.
- Tap Caller ID and spam protection.
- Turn on Block spam and scam calls.
Depending on your Galaxy phone, you may be able to choose between:
- Block all spam and scam calls
- Only block high-risk scam calls
If you are worried about legitimate businesses being filtered, starting with the high-risk option is the more conservative choice.
Samsung documents these settings in its official Galaxy call settings guide.
How to Block a Specific Phone Number on Android
If the same unwanted number repeatedly calls you, manually blocking it is simple.
On many Android phones:
- Open the Phone app.
- Open Recents or your call history.
- Tap the unwanted number.
- Choose Block or Block/report spam.
- Confirm the action.
After blocking the number, calls from it should no longer ring normally on your phone.
Blocking one number will not necessarily stop the same caller from contacting you using a different number.
How to Report a Number as Spam
If your Phone app provides a Report spam option, use it for calls you reasonably believe are spam or scams.
A common process is:
- Open your recent calls.
- Select the suspicious number.
- Tap Block/report spam or Report spam.
- Confirm the report.
Android says spam reports can contribute to improving spam detection for other users.
Do not report a legitimate business simply because you do not want to receive its calls. Block the number instead when appropriate.
How to Block Unknown or Private Numbers
Some Android phones allow you to block calls where the caller deliberately hides their number.
In the Google Phone app, look under:
Phone > Settings > Blocked numbers
Depending on your device, you may see an option relating to Unknown or unidentified callers.
On Samsung Galaxy:
- Open Phone.
- Tap the three-dot menu.
- Tap Settings.
- Tap Block numbers.
- Enable Block calls from unknown numbers if you want this behavior.
Be careful with this option. Important calls from hospitals, doctors, delivery drivers, schools, government offices, employers, or other legitimate callers can sometimes come from numbers that your phone does not recognize.
Use Call Screen When Available
Some Android phones, particularly supported Pixel devices, provide Call Screen.
Instead of immediately answering an unfamiliar call yourself, Call Screen can ask the caller why they are calling and show you information about the response.
Where supported, look inside:
Phone > Settings > Spam and Call Screen > Call Screen
The available screening modes depend on your phone and country.
This can be useful when you do not want to automatically block every unknown caller but also do not want to answer suspicious numbers yourself.
Android explains Call Screen and its availability in its spam-call protection documentation.
Why Do Spam Calls Keep Coming After You Block Them?
Blocking a phone number only blocks that particular number. Spammers and scammers can use many different numbers, so another call may appear from a number you have never seen before.
This is why automatic spam identification can be more useful than manually blocking every caller one by one.
For the best built-in protection:
- Enable caller ID and spam protection.
- Enable spam filtering when your Phone app supports it.
- Report genuine spam calls.
- Block repeated unwanted callers.
- Keep the Phone app and Android updated.
No built-in setting can guarantee that every unwanted call will be stopped. Android itself notes that spam calls cannot be completely eliminated, although its filtering and reporting tools can reduce them.
Avoid Accidentally Blocking Important Calls
There is a difference between a known spam call and a call from a number that simply is not saved in your contacts.
If you are expecting an important call, consider avoiding aggressive unknown-number blocking temporarily.
For example, an incoming call could legitimately come from:
- A medical clinic
- A delivery driver
- A job recruiter
- A school
- A bank
- A government office
- A repair technician
Using caller ID and spam detection instead of blocking every unknown number gives you more flexibility.
What If Normal Phone Calls Are Not Working Properly?
If spam blocking works but people cannot hear you during normal calls, that is a separate problem. Follow our Android call microphone not working guide.
If you cannot hear calls, media, or notifications at all, use our Android no sound troubleshooting guide instead.
Frequently Asked Questions
Can Android automatically block spam calls?
Many Android phones provide automatic spam identification or filtering through the Phone app. The exact options depend on your phone, carrier, country, and Phone app.
Do I need an app to block spam calls on Android?
Not necessarily. Google Phone and Samsung Phone include built-in tools for blocking individual numbers and identifying or filtering suspected spam on supported devices.
How do I block all spam calls on Samsung?
Open Phone > Settings > Caller ID and spam protection, enable spam protection, then turn on Block spam and scam calls. Supported Galaxy phones may let you choose between blocking all identified spam or only high-risk scam calls.
Does blocking a spam number stop them permanently?
It stops that particular number from calling normally, but the same spammer may use another number. Spam filtering is therefore useful alongside manual blocking.
Can I block calls from numbers that are not in my contacts?
Some Android phones offer unknown-number blocking, but the behavior varies. Be cautious because legitimate callers that are not saved in your contacts may also be affected.
Can blocked callers leave voicemail?
Behavior varies by phone, carrier, and voicemail service. Blocking a caller does not guarantee that the carrier will prevent every voicemail from that number.
Why don't I see Filter Spam Calls?
The feature is not identical on every Android phone. Availability can depend on the Phone app, device model, carrier, country, and whether another call-screening feature is being used.
Should I install a third-party spam blocking app?
Try the built-in Android or Samsung spam-protection features first. If you later consider a third-party call-blocking app, review its permissions and privacy policy carefully because call-screening apps may request access to sensitive calling information.
Final Thoughts
The easiest way to block spam calls on Android is to start with the tools already built into your phone. Enable caller ID and spam protection, filter suspected spam when the option is available, and manually block and report repeat callers.
Samsung Galaxy users can enable Caller ID and spam protection directly from the Samsung Phone app, while phones using Google Phone can use Google's caller ID, spam filtering, and supported Call Screen features.
You may not be able to stop every spam call permanently, but combining these built-in tools can substantially reduce how often unwanted calls interrupt you.