TL;DR: To stop spam calls and texts, stack three free layers: keep your carrier’s network spam labels on, switch on your phone’s built-in spam filter, and register on the official do not disturb list. In India that is TRAI DND: send START 0 by SMS to 1909. Then report whatever still gets through, because reports get spam numbers disconnected.
Last checked: 13 October 2026. Steps and figures below were verified against TRAI, Ofcom, FTC, Apple, Google and carrier sources on this date.
The scale explains why willpower alone fails. Truecaller’s India Insights report says it identified 41.68 billion spam calls in India in 2025, and that about two in three unknown calls to its users were spam. You need layers that judge patterns before your phone rings.
What is the fastest way to cut spam calls today?
Do the three free things that work before your phone rings. Leave your carrier’s network level spam detection on, turn on the spam filter built into your phone, and register for the official do not disturb list. Together they remove most marketing noise within days and label or silence much of the rest.
How do you stop spam calls in India with TRAI DND?
Register for TRAI’s Do Not Disturb service, which is free. Send an SMS saying START 0 to 1909 for the fully blocked setting, or call 1909 and follow the voice prompts, or set preferences in your operator’s app or the TRAI DND app. You can block single categories instead.
- Know what it covers: promotional calls and texts. Transactional messages such as OTPs and bank alerts are never blocked.
- Complain when it is breached: if a promotional call or text still arrives, complain within 7 days. By SMS to 1909, send a short description, the sender’s number or header, and the date, or use the DND app or operator app.
- Report suspected fraud separately: scam calls are not marketing. Report them on Chakshu, on the Department of Telecommunications portal at sancharsaathi.gov.in, which also lists connections registered in your name.
One 2026 change: TRAI’s updated rules move fully blocked registrations to a Block Promo setting that blocks promotional communication. Check your status in your operator app.
Why are you still getting calls after registering for DND or Do Not Call?
Because registries bind legitimate marketers, not criminals. A registered business that calls a DND number risks penalties, so legal marketing drops sharply. Scammers and unregistered telemarketers ignore the list entirely, which is why registration cuts volume but never reaches zero.
In India, legitimate promotional calls should come from the 140 series and service calls from the 160 series. A sales call from an ordinary 10 digit number is an unregistered telemarketer: complain within 7 days even if you never registered. In the US your number joins the Do Not Call Registry the next day, but sales calls can take up to 31 days to stop. In the UK the Telephone Preference Service is free at tpsonline.org.uk and can take up to 28 days. Anyone asking you to pay for registration is running a scam.
Which blocking method does what?
Each layer stops a different kind of call: carrier detection works at network level, phone filters judge the call as it arrives, registries deter legal marketers, and apps add a crowdsourced database.
| Method | What it does | Covers texts? | Main limit |
|---|---|---|---|
| Carrier network detection (India) | Labels suspected spam as the call arrives; Airtel’s is free and automatic | Yes, Airtel also flags spam SMS | Labels more than it blocks |
| Google Phone filter (Android) | Labels suspected spam; Filter spam calls stops it ringing | No, use Google Messages spam protection | Menu differs on Samsung phones |
| Samsung spam protection | Powered by Hiya; block all spam and scam calls, or only high risk ones | Separate setting in Samsung Messages | Samsung only; strict mode can drop real business calls |
| iPhone screening (iOS 26 and later) | Screens unknown callers, silences them, or lets them ring | Yes, separate Messages filtering | Callers you want are screened too |
| DND and do not call registries | Makes promotional calling to your number a rule breach | India DND covers promotional SMS; US and UK calls only | Scammers ignore it; takes days or weeks |
| Truecaller and similar apps | Crowdsourced names and spam scores; auto blocks top spammers | Yes, if it manages your messages | Ads on free tier; names can be wrong |
How do you turn on spam filtering on Android?
On phones using Google’s Phone app, tap the three dots, then Settings, then Caller ID and spam, and turn on See caller and spam ID and Filter spam calls. Suspected spam then goes to voicemail without ringing. Google’s own help page confirms the protection is on by default, so check the toggle is on.
Samsung phones use a different menu, and most guides give Samsung owners the wrong steps. On a Samsung, open Phone, then Settings, then Caller ID and spam protection, which is powered by Hiya, then Block numbers, then Block spam and scam calls, choosing all or only high risk. Pixel phones use Call Screen instead of a filter toggle. For texts, open Google Messages, then Settings, then Spam protection, and turn on Enable spam protection.
How do you stop spam calls on iPhone?
On current iPhones, go to Settings, then Apps, then Phone, then Screen Unknown Callers. Never lets them ring. Ask Reason for Calling makes the iPhone ask the caller their name and reason, showing a live transcript before your phone rings. Silence sends unsaved numbers straight to voicemail. Apple’s support page covers the same choices.
Also turn on the Unknown Callers filter in the same settings, so unknown calls collect in their own list. On older iOS versions, look for Silence Unknown Callers under Settings, then Phone. Screening pauses while roaming. For texts, open Messages, choose Manage Filtering, and turn on Screen Unknown Senders. Allow notifications for time sensitive messages so codes still reach you, and use Mark as Known for genuine senders.
How do you deal with spam texts?
Never reply, never tap the link, and never call the number in the message. Block and report the sender instead: on Android, long press the conversation and choose Block and report spam; on iPhone, use Report Junk, then block the sender separately, because reporting alone does not block. In the US and UK you can also forward the text free to 7726 so your carrier can investigate, as Ofcom’s guidance explains.
One distinction protects you: replying STOP works only for a legitimate business you recognise. Any reply tells the sender a real person reads that number, and the texts multiply. In India, report DND breaches through the 1909 route within 7 days and fraud texts, including on WhatsApp, on Chakshu. In the UK, after forwarding to 7726, report scam calls to Report Fraud on 0300 123 2040; in the US, report at reportfraud.ftc.gov. Wider habits are in our online privacy guide for beginners.
Is Truecaller worth installing?
For heavy spam in India, often yes, with your eyes open. Its crowdsourced database identifies local telemarketers and fraud numbers carrier labels miss. The trade off is trust: names are suggestions saved by other users, so callers can be mislabelled, and your number is discoverable unless you delist it.
Truecaller states on its own site that the app store version does not upload your phonebook and make it public, and that it does not record calls. Review the broad permissions after installing. One 2026 rule change: these apps cannot blanket block the designated 140, 1600 and 1601 series, though you can block numbers yourself. Keep the phone protected too; our free antivirus guide covers reputable options.
How can you spot a scam call in ten seconds?
Scam calls share tells: urgency, secrecy and an unusual payment demand. If a caller says your account will be blocked within hours, tells you not to inform anyone, or asks for payment by gift card, crypto or wire transfer, hang up. One tell is enough.
- Urgency: “Your account will be blocked in 2 hours.” Real organisations never create panic.
- Secrecy: “Keep this between us.” Scammers isolate you so nobody warns you.
- Payment method: gift cards, cryptocurrency or wire transfers. No legitimate company collects money this way.
- Caller ID mismatch: the screen shows your bank, but the caller asks you to verify your full card number or a one time password. Your bank has it and never asks.
- Too good to be true: lottery wins, grants, or jobs needing an upfront fee.
The rule that defeats nearly all of it: hang up and call the organisation back on the number on your card or its official website. Afterwards, harden your accounts with a unique password for every account and protect the handset with our free photo backup guide.
What should you do if you already shared an OTP or sent money?
Act in minutes, not days, because speed is what saves money. In India, call the national cyber fraud helpline on 1930, report at cybercrime.gov.in, then call your bank. The system freezes money still moving between accounts: the Press Information Bureau reports more than Rs 11,158 crore saved across over 32.8 lakh complaints by June 2026.
- Money sent: call 1930 in India, your bank and the payment app at once. In the UK, call your bank’s fraud team. In the US, call your bank and report at reportfraud.ftc.gov.
- Shared an OTP or password: change that password now from a device you trust, starting with email and banking, and everywhere you reused it.
- Shared card details: ask your bank to block the card on its official number.
- Installed an app they told you to: uninstall it and run a full scan. Remote access apps are a favourite scammer tool.
- In India, check your exposure: on Sanchar Saathi, confirm no connection was taken out in your name.
Then tell a family member: scammers rely on silence. More safety utilities live on our free tools hub.
Frequently asked questions
Why am I still getting spam calls after blocking the number?
Because blocking stops one number, and spam operations rotate through thousands. They also spoof caller ID, copying local numbers or numbers belonging to innocent people, while the same operation rings from a fresh one. Filters and screening beat blocking.
Will screening unknown callers make me miss doctors, couriers or job calls?
It can, which is the real cost of aggressive settings, so build a checking habit. Screened calls are not deleted: they sit in the Unknown Callers list, your blocked call history and voicemail. Check them daily while job hunting or expecting deliveries, and save genuine numbers to contacts so they reach you next time.
Should I reply STOP to a spam text or call back a missed spam number?
Only reply STOP to a legitimate business you recognise and subscribed to. For unknown senders, any reply, key press or callback confirms a live number read by a real person, and confirmed numbers get sold on. Block and report instead. Never call back missed calls from unknown international numbers either; some are premium rate traps.
Does blocking a number also block its texts and WhatsApp messages?
Blocking in your phone’s dialler blocks that number’s calls and ordinary SMS messages. It does not reach inside other apps. WhatsApp, Telegram and similar services each need their own in app block. Do both, so the sender cannot reach you anywhere.
Will changing my number stop spam calls?
Only briefly, and usually at high hassle. Recycled numbers inherit the previous owner’s spam, and number generators dial every combination, so any active number gets found. Spam targets the number, not the SIM, so switching to eSIM changes nothing. Change it only if the volume is truly unbearable, then guard the new number fiercely.
