How to Stop Spam Calls and Scam Text Messages on Android and iPhone (2026 Guide)


Android and iPhone displaying blocked spam calls and scam text warnings in a global smartphone security guide.

Spam calls and scam text messages can interrupt your day, hide legitimate communication and pressure you into sharing money, passwords or verification codes. The most effective response is not simply to block every unknown number. Use your phone’s built-in identification, screening and filtering tools first, then block and report communication that is genuinely unwanted or fraudulent.

Quick answer: On Android, enable caller ID and spam protection in the Phone app and spam protection in your messaging app. On iPhone, review Screen Unknown Callers, Call Filtering and Messages filtering. For any suspicious call or text, do not share credentials, payment information or verification codes. End the conversation and contact the claimed organization through its independently verified website, app or phone number.
Do not trust caller ID by itself: A familiar name, local number or official-looking sender label does not prove who is contacting you. Caller ID and other communication identifiers can be falsified, a practice known as spoofing.10

Estimated reading time: 16 minutes.

The Five-Minute Spam-Protection Setup

Start with these steps before installing a third-party call-blocking application. Menu names can vary, but the underlying approach works across current Android phones and iPhones.

  1. Update the phone and communication apps. Install the current stable system update and update the Phone and Messages apps through the official app store.
  2. Turn on caller identification and spam filtering. Use the built-in Phone app’s caller-ID, spam, unknown-caller or call-screening settings.
  3. Enable message spam protection. Review the spam, blocked, unknown-sender and message-filtering options in your default messaging app.
  4. Keep important contacts saved. Add family, schools, medical providers, employers and other trusted organizations so unknown-caller rules are less likely to hide them.
  5. Check filtered folders regularly. Review voicemail, Unknown Callers, Spam and Spam & blocked folders until you know your settings are behaving as expected.

Availability note: Some controls depend on the phone model, default calling or messaging app, software version, language, mobile carrier and country. If a setting in this guide is missing, update the relevant app and check the manufacturer or carrier instructions for your exact device.

Spam, Scams, Spoofing, Smishing and Vishing

These terms overlap, but they are not identical. Understanding the difference helps you choose the right response.

Spam

Unwanted or repetitive communication, often promotional. Spam can be annoying without necessarily being criminal, although fraudulent messages are frequently distributed as spam.

Scam

A deceptive attempt to obtain money, account access, personal information or another benefit. A scam may arrive through a call, SMS, RCS, iMessage or messaging service.

Spoofing

Falsifying caller ID, a sender identity, an email address or a website address so the communication appears to come from a trusted source.

Smishing and vishing

Smishing is deceptive phishing through text messages. Vishing uses voice calls. INTERPOL includes both terms in its 2026 global fraud assessment.10

A spam label is a warning, not a verdict. A legitimate business can be mislabeled, while a dangerous call may arrive without any warning. Use labels as one signal and judge the request itself.

Related Meem Gadgets guide If suspicious communication is accompanied by unknown apps, unfamiliar account activity or messages sent from your number, review our guide to signs that a phone or account may be compromised.

Block, Silence, Filter, Screen or Report?

Difference between blocking, silencing, filtering, screening and reporting unwanted calls and messages.

These actions solve different problems. Choosing the strongest option every time can cause you to miss legitimate communication, while choosing only silence may allow the same sender to keep trying.

Action What it does Best used for Important limitation
Block Stops communication from a specific number or contact Repeated unwanted contact from one known number Scammers can rotate or spoof numbers
Silence Prevents the phone from ringing while usually preserving call history or voicemail Unknown calls when interruption is the main problem You may miss a legitimate first-time caller
Filter Moves suspected spam or unknown communication into a separate list or folder Reducing clutter while retaining messages for review Filters can make mistakes
Screen Asks an unknown caller to identify themselves or provide a reason before you answer Balancing protection with access for legitimate callers Availability varies by device, language, carrier and region
Report Sends information to the platform, carrier or relevant authority Confirmed spam, scams or abuse Reporting may not automatically block the sender
Recommended default: Screen or filter unknown communication, block persistent unwanted senders and report confirmed spam or fraud. Reserve “block every unknown caller” for situations where the missed-call risk is acceptable.

How to Stop Spam Calls on Android

Android phone makers can use different calling apps, so first identify which Phone app handles your calls. The instructions below apply to Google’s Phone app; Samsung Galaxy controls are covered separately.

Turn on caller ID and spam protection in the Google Phone app

  1. Open the Phone app.
  2. Tap More options, then Settings.
  3. Open Caller ID and spam.
  4. Turn on See caller ID & spam.
  5. If available, turn on Filter spam calls.

Google says filtered spam calls remain in call history and voicemail can still be checked, although missed-call and voicemail notifications may not appear. Devices with automatic Call Screen can show different controls instead of a separate Filter spam calls switch.1

Block or report a specific caller

Open the call in the Phone app and choose Block or Report spam. If a legitimate caller was mislabeled, open that call and choose Not spam; Google says future calls to your phone from that number should no longer carry the spam label.1

Use Call Screen when it is supported

On supported phones and in supported countries, Call Screen can ask a caller who they are and why they are calling before you decide whether to answer. Availability and automation levels differ by phone, SIM country, language and region, so do not promise this feature to every Android reader.2

Do not block all unknown numbers without considering the cost: Couriers, hospitals, schools, prospective employers, repair services and businesses you recently contacted may call from numbers that are not saved.

How to Stop Scam Texts on Android

Many Android phones use Google Messages, but some use a manufacturer or carrier messaging app. Confirm the app name before following a menu path.

Check spam protection in Google Messages

  1. Open Google Messages.
  2. Tap your profile picture or initial.
  3. Open Messages settings, then Spam protection.
  4. Turn on Enable spam protection if the option is available.

Google says spam protection is normally enabled automatically when supported and can move suspected spam into a separate folder. The option appears only on devices where it is available.3

Block and report a conversation

Touch and hold the conversation, then choose Block and Report spam. You can also open a conversation, use More options, select Details, then choose Block & report spam. Reported conversations move to Spam & blocked.4

Privacy detail: Blocking and reporting are not identical. Google says reporting can send the spammer’s number, recent incoming messages and related metadata to Google; a carrier may also receive limited spam-report information. Reporting is optional, and a user can block without submitting a report.4

Review Spam & blocked for mistakes

Open the profile menu and choose Spam & blocked. If an expected verification code, delivery update or personal message is missing, check this folder before requesting repeated codes or assuming the sender failed.

Android spam-call and text-message protection using caller identification, filtering and reporting controls.

Samsung Galaxy: Smart Call and Message Blocking

Many Galaxy phones use Samsung’s Phone app and may provide Smart Call. In the Phone app, open More options, choose Settings, then look for Caller ID and spam protection or Block spam and scam calls. Available choices can include blocking all identified spam and scam calls or only high-risk scam calls.5

To block a specific number, open Phone, then Settings and Block numbers, or block it from Recents. In Samsung Messages, touch and hold an unwanted conversation and choose Block; the blocked list can be reviewed under Settings and Block numbers and spam.6

Galaxy availability note: Samsung states that Smart Call may not be available with certain carriers. Menu wording also varies by model, region and software version. If your Galaxy uses Google Messages or Google’s Phone app, follow the relevant Google section instead.

How to Stop Spam Calls on iPhone

Current iPhone software separates screening an unknown caller from filtering call-history entries and silencing calls identified as spam. Review each control instead of turning on every switch without understanding it.

Choose how unknown callers are handled

  1. Open Settings.
  2. Tap Apps, then Phone.
  3. Open Screen Unknown Callers.
  4. Choose Never, Ask Reason for Calling or Silence, depending on the options shown.

Apple says Ask Reason for Calling asks unsaved callers why they are calling before the iPhone rings, while Silence sends those calls to voicemail. Screening does not operate while roaming, and calling emergency services disables call screening for 24 hours.7

Filter unknown and carrier-identified spam calls

In Settings > Apps > Phone, look under Call Filtering. Turning on Unknown Callers moves missed calls and voicemails from unknown numbers into a separate list. The Spam control silences calls that the mobile carrier identifies as spam or fraud, sends them to voicemail and moves them into the Spam list.7

Older software may use the wording Silence Unknown Callers instead. Use the setting names shown on your own device and verify that voicemail works before relying on silence.

Block one caller

Open the Phone app, select the recent call or contact information and choose Block Caller. Blocking works well for repeated contact from one number but cannot stop the same operator from using a different or spoofed number.

How to Stop Scam Text Messages on iPhone

iPhone options for screening unknown callers and filtering suspicious text messages
Screen unknown senders

  1. Open the Messages app.
  2. Tap the Filter button.
  3. Choose Manage Filtering.
  4. Turn on Screen Unknown Senders.
  5. Review notification categories so time-sensitive messages are not hidden unnecessarily.

Apple says unknown-sender messages are moved into separate folders and normally do not notify you unless you allow a category. Available notification categories vary by country and region.8

Use text-message filtering carefully

Apple’s current Messages guide also describes a Text Message Filter for organizing SMS, MMS and RCS messages from unknown senders into folders such as Transactions and Promotions. Apple notes that filtering does not apply to a sender after you have replied three times or more; block or report persistent unwanted senders instead.8

Report spam, then block when necessary

Reporting an iMessage as spam sends the message and sender information to Apple and deletes it from the iPhone. Apple explicitly says reporting alone does not prevent future messages, so block the sender if you want communication from that number or contact to stop.9

For SMS, MMS or RCS reporting, the available option can depend on the carrier. To block a sender, open the conversation, tap the sender at the top, choose Info, then Block Contact. A blocked contact is also blocked across other supported Apple communication apps.9

Check the filtered folders: Verification codes, appointment reminders, couriers and new professional contacts can appear under Unknown Senders or another filtered category. Review these folders before deleting everything.
Common warning signs in scam calls and messages including urgency, payment demands, suspicious links and verification-code requests.

Warning Signs of a Scam Call or Text

Scams change their stories, but the pressure techniques are remarkably consistent. Treat any unexpected communication cautiously when it includes one or more of these signs.

Artificial urgency. “Pay now,” “act in ten minutes” or “your account closes today.”
Secrecy. Instructions not to tell family, colleagues, the bank or police.
Verification-code request. A demand for an SMS, authenticator or account-recovery code.
Unusual payment. Gift cards, cryptocurrency, wire transfers or payment to a personal account.
Remote-access request. Instructions to install an app or share your screen so “support” can control the phone.
Unexpected link. A delivery, tax, toll, prize, job or banking link you did not request.
Fear or emotional pressure. Threats of arrest, lost service, family emergency or public embarrassment.
Too-good-to-be-true reward. A prize, refund, investment return or easy job that requires money or private information first.

INTERPOL advises people not to provide confidential information over the phone, not to panic over emergency stories and not to call back using the number supplied by a suspicious caller. Verify the claim independently.11 Apple similarly warns against sharing passwords, security codes or account details in response to unsolicited contact.12

The safest verification method

  1. End the call or leave the message unanswered.
  2. Do not use the provided link, callback number or search advertisement.
  3. Open the organization’s official app, type its known website address yourself or use the number printed on a genuine card, statement or document.
  4. Ask whether the request, transaction, case number or account warning is real.
  5. Report the impersonation through the organization’s official fraud channel.

The U.S. Federal Trade Commission gives the same broadly useful principle for unexpected texts: do not click the link; contact the organization through a website or number you already know is genuine.13

Use Carrier and Regional Anti-Spam Tools

Phone settings are only one layer. Mobile carriers can identify or block traffic at the network level, provide spam labels, offer an official call-protection app or accept reports about unwanted communication. Use the carrier’s official website, app, published support number or physical store—not a link sent in the suspicious message.

Some countries also operate do-not-call registers, national cybercrime reporting portals, telecommunications complaint systems or dedicated short codes for forwarding suspected spam. These systems are not universal, so Meem Gadgets does not recommend one country’s process as though it applies worldwide.

Ask what the carrier can filter. Calls, SMS, RCS and voicemail controls may be separate.
Confirm the cost. Some network protections are free, while others are paid services.
Review privacy terms. Understand what call or message data a protection service processes.
Use the correct regional authority. Report fraud, threats or harassment through the official process where you live.
Related Meem Gadgets guide If you are changing carriers or moving a phone number after persistent abuse, our eSIM guide explains how digital SIM profiles differ from removable SIM cards.
Damage-control steps after replying to a scam message, opening a suspicious link or sending money.

What to Do If You Already Replied, Clicked or Paid

The correct response depends on what happened. Replying “stop” to a legitimate marketing sender is different from giving a password to a fake bank page or installing remote-access software.

What happened Immediate response Next checks
You replied but shared no sensitive information Stop responding, save evidence, then block and report Expect possible follow-up attempts from other numbers
You opened a link but entered nothing Close the page; do not download or approve anything Check downloads, browser permissions and device-security warnings
You entered a password Go directly to the real service and change the password immediately Review active sessions, recovery details and two-factor authentication
You shared a verification or recovery code Secure the affected account through its official recovery process Remove unknown devices or sessions and contact support if access changed
You shared card or bank information Contact the financial provider through its verified number immediately Ask about blocking the card, protecting the account and disputing fraud
You sent money Contact the bank or payment provider immediately and request its fraud process Preserve receipts and report through local police or cybercrime channels
You installed an app or configuration profile Stop granting permissions and remove untrusted software using official guidance Review account activity and scan or inspect the device before using sensitive apps

On Android, Google recommends enabling Play Protect, installing security updates and removing apps you do not trust when harmful software is suspected.14 If unauthorized sign-ins, unknown apps or outgoing messages appear, treat the problem as a possible account or device compromise rather than ordinary spam.

Continue with the correct security guide Use our hacked-phone response guide when the device behaves suspiciously. If the phone itself disappears during an incident, follow our lost-or-stolen phone checklist.

How to Reduce Spam Without Missing Legitimate Calls

A phone that never rings is not automatically well protected. The goal is to reduce unwanted contact while keeping a safe route for genuine callers.

Use screening or voicemail

When available, asking a caller to state a reason or sending unknown callers to voicemail preserves a route for a genuine person to explain why they called.

Save expected contacts

Add medical providers, schools, delivery services, workplaces and businesses you are actively dealing with. Update changed numbers instead of assuming every unknown call is spam.

Review folders and voicemail

Check filtered calls, spam folders and voicemail daily at first. Mark legitimate communication as known or not spam when the platform allows it.

Protect verification messages

Do not request many replacement codes before checking filtered folders. Repeated requests can trigger delays or account-security controls.

Consider telling important organizations that your phone screens unknown calls. Ask them to leave a clear voicemail that does not disclose private medical, financial or account information.

Long-Term Protection Against Spam and Phone Scams

Keep software updated. Phone, Messages, carrier and security updates can improve detection and fix vulnerabilities.
Limit public exposure. Avoid posting your primary phone number openly unless there is a clear reason.
Use unique passwords. A scam that steals one password should not unlock several accounts.
Enable two-factor protection. Prefer strong account-security options and never share a verification code.
Use official apps and stores. Do not install an unknown “security” or remote-support app because a caller demands it.
Teach family verification. Agree on a separate way to confirm urgent money or emergency requests.
Protect voicemail. Use a strong voicemail PIN where the carrier provides one.
Report patterns. Preserve dates, numbers, screenshots, voicemails and payment details for official reports.
Threats and harassment are different from ordinary spam: Preserve evidence instead of repeatedly engaging. Contact the mobile carrier and the appropriate local law-enforcement, cybercrime or safeguarding service when messages include credible threats, stalking, extortion or repeated targeted abuse.
Final takeaway: Turn on the built-in protections, but do not surrender your judgment to a label. Screen or filter unknown contact, independently verify urgent claims, block persistent senders, report confirmed scams and act immediately if money or account credentials have already been exposed.

Frequently Asked Questions

Why do spam calls continue after I block a number?

Blocking stops that specific number or contact. Spam operations often rotate numbers or falsify caller ID, so combine blocking with spam identification, filtering, screening and carrier-level tools.

Should I answer a call marked “Spam”?

A spam label is a warning, not proof. Let the call go through screening or voicemail if you are uncertain. Verify any request through an official channel before sharing information or making a payment.

Can a scammer make a real bank or government number appear on caller ID?

Caller ID can be spoofed, so an official-looking number does not authenticate the caller. End the call and contact the organization using a number from its verified website, app, card or statement.

Does reporting a message automatically block the sender?

Not always. In Google Messages, the combined Block and report spam action normally does both. Apple states that reporting spam alone does not prevent future messages, so block the sender separately when needed.

Will filtering unknown callers stop verification codes?

Call filtering does not normally control text-message delivery, but message filtering can move verification texts into an unknown-sender, transaction or spam folder. Check filtered folders when an expected code does not appear.

Should I reply “STOP” to every unwanted text?

Use STOP only for a sender you recognize as a legitimate subscription or business messaging service. Do not reply to an unexpected suspicious text, because responding engages the sender and can continue the scam conversation.

Can blocking all unknown callers hide important calls?

Yes. Hospitals, couriers, schools, employers and businesses may call from numbers you have not saved. Screening, voicemail or an unknown-caller list can provide a safer balance than rejecting everything.

Do I need a third-party spam-blocking app?

Not necessarily. Start with the phone maker and carrier controls. If you consider another app, check its developer, permissions, privacy policy, subscription terms, regional support and method for correcting false labels.

What should I do with a threatening message?

Do not treat targeted threats as ordinary marketing spam. Preserve screenshots, numbers, dates, voicemails and message details, avoid confrontation, and use the appropriate carrier and local law-enforcement or safeguarding process.

What if a legitimate caller was marked as spam?

Open the call or message in the relevant app and use Not spam, Mark as known or an equivalent correction when available. Save the contact and review the app’s blocked list.

Is it safe to call back an unknown number?

Do not call back solely because the caller created urgency. Listen to the voicemail and independently verify the person or organization. Use a trusted official number rather than the number supplied in the suspicious message.

What is the first thing to do after paying a scammer?

Contact the bank, card issuer or payment provider immediately through its verified channel and ask for the fraud or transfer-recall process. Preserve evidence and make the appropriate official report in your country.

Official Sources and Further Reading

  1. Google Phone Help — Use Caller ID and Spam Protection
  2. Google Phone Help — Screen Calls Before You Answer
  3. Google Messages Help — Spam Detection and Privacy
  4. Google Messages Help — Report Spam in Google Messages
  5. Samsung Support — Block Spam Calls With Smart Call
  6. Samsung Support — Block a Phone Number or Contact on Galaxy
  7. Apple Support — Manage Unknown Callers on iPhone
  8. Apple iPhone User Guide — Screen and Filter Text Messages
  9. Apple iPhone User Guide — Report Spam and Block Senders
  10. INTERPOL — Global Financial Fraud Threat Assessment 2026
  11. INTERPOL — Financial Crime: Do Not Become a Victim
  12. Apple Support — Recognize and Avoid Social Engineering Schemes
  13. U.S. Federal Trade Commission — Recognize and Report Spam Text Messages
  14. Google Account Help — Remove Malware or Unsafe Software on Android

Compatibility and regional note: Calling, messaging, spam-reporting, carrier filtering and fraud-reporting options vary by device, software version, default app, language, carrier and country. Use the official instructions for your exact device and region.

About the Author

Shahroze Azmat is the founder and technology writer behind Meem Gadgets. He writes practical, research-based guides about smartphones, mobile security, connectivity and everyday technology. This article was checked against current Google, Apple, Samsung, INTERPOL and consumer-protection guidance.

About Meem Gadgets

Meem Gadgets publishes clear, independently researched guides that help readers understand, choose, protect and troubleshoot smartphones and mobile technology.

Written by Shahroze Azmat • Fact-checked and updated July 31, 2026

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