Spam calls have become one of the most common problems affecting smartphone users. Many Android users receive unwanted calls from advertisers, scammers, fake support agents, and unknown numbers every day.
Besides being annoying, spam calls can also become a security risk. Some scammers use phone calls to steal personal information, trick users into sending money, or gain access to online accounts.
In this complete 2026 guide, you will learn how to block spam calls on Android, identify suspicious callers, use built-in phone security features, and protect yourself from phone scams.
Never share passwords, verification codes, banking details, or personal information with unknown callers, even if they claim to represent a trusted company.
What Are Spam Calls?
Spam calls are unwanted phone calls sent to many people, usually for advertising, scams, surveys, or fraudulent activities.
Common Types of Spam Calls:
- Fake bank security calls.
- Loan and investment scams.
- Fake mobile network promotions.
- Insurance and marketing calls.
- Robocalls from automated systems.
- Scammers pretending to be customer support.
Why You Receive Spam Calls
Understanding why spam calls happen can help you reduce them.
Common Reasons:
- Your number appears in leaked databases.
- You registered on websites using your phone number.
- You installed apps requesting unnecessary permissions.
- Your number was shared or sold by services.
- You answered previous spam calls.
Method 1: Block Spam Calls Using Android Phone App
Most modern Android phones include built-in spam protection features that can identify and block suspicious callers.
Open the default calling application on your Android phone.
Turn on options such as spam caller identification and filtering.
Method 2: Block a Specific Phone Number
If a certain number keeps calling you, Android allows you to block it manually.
- Open Phone app.
- Open Recent Calls.
- Select the unwanted number.
- Tap Block or Report Spam.
The blocked number will no longer be able to call or contact you through normal phone calls.
Method 3: Use Google Phone Spam Protection
Google Phone app includes spam detection features that help identify suspicious callers before you answer.
Features Include:
- Caller identification.
- Spam warnings.
- Automatic call screening.
- Reporting suspicious numbers.
Method 4: Block Unknown Callers on Android
Some Android devices allow users to automatically block calls from unknown numbers.
Blocking unknown callers may also block important calls from people whose numbers are not saved in your contacts.
Method 5: Use USSD Codes To Manage Call Blocking and Forwarding
Many mobile networks provide USSD codes that allow users to check and manage calling services. These codes can help you identify unusual call forwarding settings and control unwanted call features.
USSD codes depend on your mobile network provider and country. Some codes may not work on every network.
Check Call Forwarding Status
This code checks whether unconditional call forwarding is enabled on your phone.
Check Forwarding When Phone Is Unreachable
Shows where calls may be redirected when your phone is switched off or unavailable.
Check Forwarding When Busy
Checks whether calls are forwarded when your line is busy.
Cancel Call Forwarding Settings
This code can remove active call forwarding settings on many networks.
Some networks use forwarding for voicemail services. Confirm your carrier settings before disabling all forwarding.
Method 6: Block Spam Calls Using Truecaller
Truecaller is one of the most popular caller identification and spam blocking applications available for Android.
It uses a large community database to identify numbers reported as spam and warn users before answering suspicious calls.
- Install Truecaller from Google Play Store.
- Open the application.
- Verify your phone number.
- Allow caller ID permissions.
- Enable Spam Protection.
Truecaller Features:
- Spam caller identification.
- Automatic blocking of known spam numbers.
- Caller name detection.
- Community spam reports.
- Unknown caller warnings.
Keep Truecaller updated because spam databases change frequently as new scam numbers appear.
Method 7: Use Google Phone App Call Screening
Android phones using the Google Phone application can use built-in call screening features to identify suspicious callers.
Google Phone Protection Includes:
- Spam warnings.
- Caller identification.
- Verified business calls.
- Automatic spam filtering.
Method 8: Use Carrier Spam Blocking Services
Mobile network providers often provide their own spam protection services that can block unwanted calls before they reach your phone.
Contact Your Network Provider For:
- Spam call blocking.
- Fraud protection.
- Caller verification services.
- Number privacy options.
If you continue receiving scam calls, report the numbers to your network provider so they can investigate and block abusive callers.
Method 9: Report Spam Numbers
Reporting spam numbers helps improve call filtering systems and protects other users.
- Phone application.
- Truecaller.
- Google Phone.
- Mobile network provider.
Method 10: Protect Yourself From Phone Scams
Blocking spam calls is useful, but knowing how scammers operate is equally important.
Never Share:
- OTP verification codes.
- Bank PIN numbers.
- Passwords.
- Mobile money security codes.
- Personal identification information.
- "Your account will be blocked today."
- "You won a prize."
- "We are calling from technical support."
- "Send a verification code."
Extra Tips To Reduce Spam Calls
- Do not answer unknown calls repeatedly.
- Avoid calling back suspicious missed calls.
- Do not publish your phone number everywhere online.
- Remove unnecessary apps with contact permissions.
- Use call filtering features.
- Keep Android security updates installed.
Frequently Asked Questions (FAQ)
Does dialing codes remove hackers from my phone?
No. USSD codes mainly check phone services such as call forwarding. They do not detect all hacking methods.
Is Truecaller safe to use?
Truecaller is widely used for caller identification and spam blocking. Always review permissions and privacy settings before allowing access.
Why do I still receive spam calls after blocking numbers?
Scammers often use new numbers or fake caller IDs. Combining blocking tools with spam detection provides better protection.
Can I completely stop all spam calls?
No method can guarantee zero spam calls, but using Android protection, carrier tools, and caller ID services can greatly reduce them.
Final Thoughts
Spam calls are more than just an annoyance. Some calls are designed to steal personal information, money, or access to online accounts.
The best protection is combining Android built-in spam filtering, trusted applications like Truecaller, network provider services, and safe calling habits.
By following these methods, you can significantly reduce unwanted calls and keep your Android phone safer in 2026.
Anania Julius
Anania Julius is a technology content creator with 5 years of experience. He shares practical guides, software tips, Android solutions, and digital tutorials to help users solve everyday technology challenges.