Spam callers don’t pick numbers out of thin air. Your number usually ends up on a list after a data breach, app signup, online form, or marketing database sale. Once scammers know a number is active, it often gets shared or sold again.
If you’re wondering how to block spam calls on Android, the good news is that most Android phones already include built-in tools that can dramatically reduce unwanted calls. This guide walks you through the settings that matter, plus a few extra steps that can stop many spam calls before your phone even rings.
Everything you need to know to keep your phone from getting hacked.
1. How to Block Spam Calls on Android Using Samsung Smart Call
If you have a Samsung Galaxy phone, start here.
Samsung includes a built-in feature called Smart Call that can identify suspected spam callers and warn you before you answer. Many Samsung owners never realize it’s sitting there quietly doing nothing until they turn it on.
How to enable Smart Call on Samsung
- Open the Phone app
- Tap the three dots (⋮) in the top-right corner
- Select Settings
- Tap Caller ID and spam protection
- Toggle Caller ID and spam protection ON
Once enabled, Samsung will flag many suspected spam callers before you answer. Instead of seeing only a number, you’ll often see a warning identifying the call as potential spam.
To block unknown callers completely
- Open Phone app Settings
- Tap Block numbers
- Turn on Block unknown callers
If you’re getting hammered by spam calls every day, this setting can make a surprisingly big difference. Unknown callers are sent directly to voicemail, while legitimate callers can still leave a message.
Note: Smart Call is effective, but no spam filter catches everything. Think of it as your first layer of protection.
2. Turn On Google’s Spam Protection
Many Android devices use Google’s Phone app as the default dialer.
Google includes built-in spam detection that can identify and filter many unwanted calls automatically.
How to enable Google’s spam protection
- Open the Phone app
- Tap the three dots (⋮)
- Go to Settings
- Tap Caller ID & Spam
- Turn on:
- See caller & spam ID
- Filter spam calls
When enabled, Android can identify likely spam callers and automatically send many of them straight to voicemail without disturbing you. For most people, this is one of the easiest ways to block spam calls on Android without installing any additional apps.
3. Block Individual Numbers Manually
Some spam callers repeatedly use the same number. When that happens, manual blocking is quick and effective.
How to block a number on Android
- Open the Phone app
- Go to Recent calls
- Tap and hold the number
- Select Block or Report as spam
Reporting a number as spam helps improve spam databases used by Google and other call-filtering services, potentially protecting other users as well.
4. What Is #662# on Android?
If you’ve searched for spam-call solutions online, you’ve probably come across #662#.
This is not an Android setting. It’s a carrier-level spam blocking feature offered by some mobile providers.
T-Mobile Users
At the time of writing, eligible T-Mobile customers can typically activate Scam Block by dialing:
#662#
This helps block many suspected scam calls before they even reach your phone.
AT&T Users
AT&T offers spam protection through ActiveArmor, available through the AT&T app.
Verizon Users
Verizon customers can use Call Filter, which includes a free spam-blocking tier.
Outside the United States?
Many Australian, UK, Canadian, and European carriers offer similar call-protection services. Search your carrier’s website for:
- Spam blocking
- Call protection
- Scam call filtering
Question: Do these secret codes really help to figure out if your phone is hacked?
Why carrier-level blocking matters
Your phone’s spam filter works on the device itself.
Carrier spam protection works at the network level, which means some calls are blocked before they ever reach your phone.
Using both creates two layers of protection.
5. Register With the Do Not Call Registry
This won’t stop scammers, but it can significantly reduce legitimate telemarketing calls.
Australia? Head to: https://www.donotcall.gov.au
United States? Go here: https://www.donotcall.gov
Registration is free and takes only a few minutes.
Once registered, you generally won’t need to renew your registration.
If you think your Identity might be compromised then check this step by step guide on how to recover from Identity Theft.
6. Use a Call-Blocking App if Spam Calls Continue
If spam callers are still slipping through, a dedicated call-blocking app can provide another layer of defence.
Hiya
- Real-time spam identification
- Works alongside existing phone apps
- Strong free version
Truecaller
- Massive caller database
- Particularly effective in Australia, India, the UK, and the US
- Identifies many unknown callers
Privacy note: Truecaller relies heavily on its caller database. Review permissions and privacy settings before installing.
Robokiller
- Paid service
- Automatically answers spam calls with pre-recorded responses
- Designed to waste robocallers’ time
Stay Safe When Installing Apps
Only download call-blocking apps from the Google Play Store.
Be cautious of apps requesting unnecessary access to:
- SMS messages
- Contacts
- Phone data
Stick with established apps that have large numbers of verified reviews.
7. Stop Your Number Spreading in the First Place
Blocking spam calls is important.
Stopping your number from being shared is even better.
Reduce future spam calls by:
- Avoiding public posts that include your mobile number
- Skipping contests or giveaways that require your phone number
- Reviewing app permissions regularly
- Denying contact-list access to apps that don’t need it
- Using a secondary number for online forms when possible
Google Voice (where available), a secondary SIM, or a low-cost prepaid number can help keep your primary number private.
8. Keep Android Updated
Software updates don’t just add new features.
They also improve security and can strengthen spam detection systems.
Check for updates
Most Android phones: Settings → System → Software Update
Samsung phones: Settings → Software Update → Download and Install
Enable automatic updates whenever possible so your phone stays protected without you having to think about it.
When Spam Calls Might Be a Bigger Warning Sign
A sudden spike in spam calls isn’t always random.
In some cases, it can happen after:
- A data breach
- Personal information exposure
- Identity theft
- Leaked account information
If you’re suddenly receiving large volumes of spam calls, texts, and phishing emails at the same time, it may be worth checking whether your personal information has appeared in a known data breach.
Quick Summary: Android Spam Blocking Layers
| Protection Layer | What It Does | Where to Enable |
|---|---|---|
| Samsung Smart Call | Identifies and flags spam calls | Phone app → Settings → Caller ID |
| Google Spam Protection | Filters spam calls automatically | Phone app → Caller ID & Spam |
| Manual Blocking | Stops repeat offenders | Recent Calls → long press |
| Carrier Protection (#662#, ActiveArmor, Call Filter) | Blocks calls at network level | Dial #662# or carrier app |
| Do Not Call Registry | Reduces legitimate telemarketing | donotcall.gov / and donotcall.gov.au |
| Call-Blocking third party Apps | Extra layer for persistent spam | Hiya, Truecaller, Robokiller |
The most effective way to block spam calls on Android is to use multiple layers together rather than relying on a single setting.
FAQ- How to Block Spam calls on Android Phone
Why am I suddenly getting so many spam calls on Android?
Your number may have been exposed through a data breach, marketing list, online form, app registration, or public profile. Once a number is identified as active, it can be shared among multiple telemarketing and scam databases.
Can Android automatically block spam calls?
Yes. Samsung Smart Call and Google’s Caller ID & Spam Protection can automatically identify and filter many spam calls before they reach you.
What does #662# do?
For eligible T-Mobile customers, dialing #662# activates Scam Block, a carrier-level service that helps block suspected scam calls before they reach your phone.
Is Truecaller safe to use?
Generally yes, but users should review the app’s privacy policy and permissions before installing. Like many caller-identification services, it relies on a large database of phone numbers.
Will the Do Not Call Registry stop scam calls?
No. Scammers typically ignore the registry because they are already breaking the law. However, registration can significantly reduce legitimate telemarketing calls.
Should I answer unknown numbers?
Usually not. If the call is legitimate, the caller will typically leave a voicemail. Answering spam calls can confirm your number is active, which may lead to more unwanted calls.
Do spam calls mean my phone has been hacked?
Not usually. Most spam calls happen because your number has been shared, sold, exposed in a breach, or added to marketing databases. However, if spam calls are accompanied by suspicious account activity, it’s worth reviewing your security settings.
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Such great tips! As someone that used to work in fraud this is so important!
Thank you
With so many data breaches, it’s become difficult to keep my information secure. Thanks for the helpful tips!
I so agree with you Jou – data security has become very hard.