What Is a 140 Phone Number? Why They Call, and 1600 Numbers

November 3, 2026 · By Piyush Sahoo A 140 phone number belongs to India’s designated series for promotional calls. Any registered business can use it to advertise a loan, a plot, a course or a phone plan. It tells you the call is marketing, not who is calling. You can stop these calls through TRAI’s Do Not Disturb registry.

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What does a 140 number actually tell you?

It tells you the type of call, and nothing about the company. Think of the prefix as a label on an envelope that says “advertising”, with no return address. That has two practical effects:

• You can’t identify a company from the digits. TRAI’s own explanatory notes say 140 numbers are shared among multiple businesses. So the same number can reach you for different companies, and a lookup won’t reliably give you a name. Ask the caller which company they represent.
• You can decide before you answer. A 140 call is a sales call. If you aren’t in the mood to hear an offer, you can let it ring, and you won’t miss a bank alert by doing so, because those belong on a different series.

You may also see the series written as 140xx or 140-XXXX. Those are the same thing. The “x” stands for the digits that follow. The businesses behind these calls fall into eight categories that TRAI lets you control separately: The right-hand examples are ours, to show what each label means in daily life. The category names are TRAI’s.

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Why do 140 numbers keep calling you?

The short answer is that no one has told the system you object. India uses an opt-out model for promotional calls. In its September 2026 notification, TRAI says a customer’s consent is treated as existing until that customer registers a preference to stop the calls. So your number doesn’t need to be leaked or sold for a 140 call to be lawful. Being reachable and not having opted out is enough for a registered sender to try. Here is how the main checks fit together. Three situations explain most “but I’m on DND” surprises:

• You ticked a consent box somewhere. TRAI’s 2025 rules say that calls backed by your explicit digital consent are delivered whatever you’ve blocked in that category. You can revoke that consent. After you opt out, the business can’t ask you for consent again for 90 days.
• You asked about a product. Under the September 2026 changes, a business may contact you for seven days after your written or digital inquiry. That form you filled in for a car quote can legitimately produce calls for a week. A full application stretches the window to three months.
• You blocked some categories, not all. A real estate block does nothing about credit card offers. Check what you actually selected.

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What time can a 140 number call you?

TRAI’s preference rules split the day into bands. Four of them are off by default for every customer: midnight to 6 AM, 6 AM to 8 AM, 8 AM to 10 AM, and 9 PM to midnight. That leaves 10 AM to 9 PM as the default window. This chart comes from TRAI’s consolidated text of the regulations, which TRAI publishes for reference. The gazetted text prevails if the two ever differ. If a sales call rings at 7 AM and you haven’t switched that band on, it’s worth reporting.

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How do you stop calls from 140 numbers?

Use the DND registry. It’s the route TRAI’s rules set for stopping 140 calls by sector, and your operator has to apply it. Blocking one number on your own phone is also your right under the September 2026 text, but it only stops that number.

1. Choose your channel. Dial 1909, send an SMS to 1909, or use the TRAI DND app.
2. Decide how much to block. Use the table below. Blocking only the categories that annoy you keeps the offers you might want.
3. Allow a day. Operators must apply your choice in near real time, and within 24 hours at the outside.
4. Report what gets through. You have seven days from the call to complain. Your phone number, the caller’s number, the date and a short description are enough for a valid complaint. Use 1909, the DND app or your operator’s app.
5. Appeal if the result is wrong. The September 2026 changes add an appeal within 15 days against the way your complaint was resolved.

These codes come from the schedule in TRAI’s September 2026 notification. Check them against the prompts on 1909 or in the app, because the changes phase in over the months after Gazette publication. The “fully block” setting is changing. The same notification moves everyone on Fully Block to Block Promo within 15 days of commencement. Block Promo stops promotions, and it doesn’t stop service calls, transaction calls or government calls. If you relied on Fully Block to silence everything, expect these to keep coming. Caller ID apps can’t do this for you. TRAI says tagging or filtering 140 calls is not allowed, so apps may show you less than you expect on these numbers. The September 2026 text writes this into the rules for apps that offer spam reporting, and it keeps your freedom to block or filter on your own device. Truecaller disagrees publicly. Its CEO argues that the restriction has made spam worse on these series, and he has said Truecaller users block 4 lakh 140 calls and 1.25 lakh 1600 calls every day. That figure is the company’s own and we couldn’t verify it. For now, the regulator’s route is the one that binds your operator.

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Is it safe to answer a 140 number?

It’s generally safe to answer and listen. What matters is what the caller asks you to do. CallerDesk makes a useful distinction here: the digits describe the kind of call, and they say nothing about whether the offer suits you. Use this rule on any unexpected call, from any number:

• Stop if you’re asked for an OTP, PIN, CVV or password. No promotional offer needs them.
• Stop if you’re asked to install an app or move money. Hang up and contact the company through its own website or app.
• Don’t rely on calling back. The series is built for outbound promotion, so the number may not take your call.

If you think someone tried to defraud you, use the channel that fits what happened:

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How are 1600 numbers different from 140 numbers?

They exist for the opposite reason. A 140 call wants to sell you something. A 1600 call is meant to tell you something about what you already have, such as a loan, a policy or a government service. A few details matter here:

• Who can get one. TRAI limits 1600xx to government bodies and firms under RBI, SEBI, IRDAI or PFRDA. That narrow list is the point. TRAI wants customers to recognise these callers from the number alone. It describes fraudsters as using normal 10-digit numbers to pose as real businesses.
• What about “160”? Older guides, and some product pages, shorten the name to the 160 series. They mean the same 1600 service series. Vobiz’s documentation uses the short form.
• 1601 is newer. TRAI began rolling out 1601 in August 2026 for electricity, water, gas and LPG suppliers, plus courier and logistics firms. It gave operators 90 days to onboard them. These numbers go directly to verified businesses, not to middlemen.
• A sales pitch from a 1600 number is misuse. TRAI says its rules carry strict action against senders who use 1600 numbers for promotion. Report it through 1909.

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Which 1600 deadlines have already passed?

All of the fixed ones. TRAI’s November 2025 direction set the dates for firms under RBI, SEBI and PFRDA. A December 2025 direction added insurers under IRDAI. After its date, a covered firm can’t place service or transaction calls from other numbers, even with your consent. So if your bank’s service call now comes from a plain 10-digit mobile number, be careful. Hang up and call the number on your card or the bank’s app.

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What should your business do about 140 numbers?

If you call customers in India to sell anything, the 140 series is the route. TRAI says promotional calls can be made only from 140xx. Sales staff using personal mobiles put your connections at risk. TRAI’s 2025 rules restrict normal 10-digit numbers for telemarketing, and repeat violations can disconnect all of a sender’s telecom resources. The choice of series depends on what the call says and who you are. Four points catch teams out:

• Mixed calls count as promotional. The rule is blunt: promotional content in any commercial call makes it a promotional call. So a bank’s payment reminder that ends with a credit card pitch belongs on 140.
• “Transactional” has a clock. It means a call in response to something the customer did, within 30 minutes. Calls outside that definition may be service calls, with their own consent rules.
• Complaints add up faster now. The 2025 rules set the trigger at five complaints in ten days, with outgoing services barred for 15 days on a first breach. Repeat breaches mean one-year disconnection and blacklisting. The 2026 changes add a lower trigger of three complaints where AI systems have also flagged the number.
• Automated calls need declaring. TRAI now requires anyone placing application-driven calls to declare them first, or they count as unsolicited. That includes dialers and voice bots. The notification sets this to start 60 days after Gazette publication, and we couldn’t confirm the publication date. Calls on the designated series are exempt from the new termination charge, but not from the declaration.

Some use cases don’t fit neatly. Debt collection is the best known. Exotel’s notes on an industry webinar raised it as a concern, because a 140 call can’t reach anyone who has blocked the category. That page predates the current deadlines. We didn’t find a TRAI document that settles the question for every lender, so take this one to your compliance team. One honest trade-off: a 140 number is a visible label. Your calls will be recognised as marketing, and some people won’t answer. That’s the design. Good targeting and a clear opening line matter more than the digits, and consent you can prove protects you when a complaint arrives.

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How Vobiz handles 140 and 160 numbers

Vobiz provisions both series on request, for customers who meet the DLT and document requirements. Actions like these involve real calls and real cost, so run them only with your own credentials and after you’ve confirmed the details with your compliance owner.

• Getting a 140 number. Vobiz assigns it from its pool to your TATA DLT ID. You sign a letter of intent, submit documents, approve the number on your DLT platform, and register your template. The guide lists calling hours of 10 AM to 8 PM for this series.
• Getting a 160 number. There are two routes. You can acquire the number from your operator and have Vobiz deliver it, or Vobiz can acquire it on your behalf.
• Registering your business. DLT entity registration comes first, followed by per-number provisioning.
• Handling inbound. Both series are outbound only on Vobiz. For callbacks, Vobiz provides DID numbers you can pair with your setup.
• Do Not Call checks. Vobiz checks regulated outbound calls against the NDNC registry, blocks calls to registered numbers that lack documented consent, and logs the attempts. The same page explains how complaint notices and proof deadlines work.
• Capacity. 140 and 160 calls use dedicated capacity, provisioned on request and separate from your account’s central pool.

For day-to-day calling habits, the number utilization guide covers daily volumes and warm versus cold calling.

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Frequently asked questions

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Further reading on Vobiz

• 140 and 160 series acquisition guide · Do you provide 140, 160 and 92 series numbers? · DID provisioning process
• India calling regulations · UCC and NDNC compliance · DLT entity registration
• What is caller ID and CNAM? · What is a DID number? · Toll-free vs local vs mobile numbers

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Sources

Indian regulators and government

• TRAI, Press release 91/2026: clarifications on the 1600 and 140 series, 10 July 2026.
• TRAI, Telecom Commercial Communications Customer Preference (Third Amendment) Regulations, 2026, 18 September 2026.
• TRAI, Press release 119/2026 on the Third Amendment, 18 September 2026.
• TRAI, Press release 113/2026 on the 1601 series, 10 August 2026.
• TRAI, Direction on phase-wise adoption of 1600-series numbers, 19 November 2025.
• TRAI, Direction on mandatory adoption of 1600-series numbers by IRDAI-regulated entities, 16 December 2025.
• TRAI, Second Amendment Regulations, 2025, 12 February 2025.
• TRAI, Press release 11/2025 on the TCCCPR amendments, 12 February 2025.
• TRAI, Consolidated TCCCPR text, for reference only, May 2026.
• TRAI, FAQ on unsolicited commercial communications, read 3 November 2026. Its three-day complaint window predates the seven-day limit in press release 11/2025.
• PIB, Chakshu facility of Sanchar Saathi, 5 February 2026.
• PIB, Financial Fraud Risk Indicator release, with the 1930 advice, 8 September 2026.

News and industry

• Inc42, Why Truecaller and TRAI are clashing over 140 and 1600 number tags, July 2026.
• Outlook Business, Phone calls from 1600 number series cannot be blocked, July 2026.
• CallerDesk, Phone number starting with 140: who calls and how to block it, read 3 November 2026.
• Exotel, Decoding new calling regulations: 140 and 160 numbers, read 3 November 2026.