India’s telecom regulator has introduced a new 1601-series numbering system for service and transactional calls from utility, courier and logistics companies, expanding the country’s trusted-numbering framework beyond banks, financial institutions and government organisations.
The Telecom Regulatory Authority of India (TRAI) said the move is intended to help consumers distinguish genuine service calls from fraudulent calls made using ordinary 10-digit mobile numbers. The rollout will initially cover utilities, courier and logistics companies, with telecom operators given 90 days to complete onboarding and migration of eligible entities.
The move builds on the experience of the 1600-series, which is already being used for service and transactional calls by entities in the banking, financial services and insurance (BFSI) sector and government organisations.
Why TRAI is introducing the 1601 series
Fraudsters increasingly impersonate legitimate companies when making phone calls. A caller may claim to represent an electricity provider, LPG company, courier service or logistics firm and then attempt to obtain personal information, payment details or one-time passwords.
The problem is that legitimate companies have traditionally used regular 10-digit numbers for many customer-service calls, making it difficult for consumers to immediately identify whether a call is genuine.
TRAI’s new numbering framework attempts to create a clearer distinction.
TRAI'S TRUSTED CALLING FRAMEWORK
Regular 10-digit numbers
↓
Difficult for consumers to identify
↓
Higher impersonation risk
VS
1601-series
↓
Verified service/transactional caller
↓
Easier identification
↓
Lower impersonation risk
TRAI said the distinct numbering identity is intended to strengthen consumer trust and help combat impersonation by fraudsters using ordinary 10-digit numbers.
Which companies will use 1601 numbers?
The first phase will cover two broad categories: utilities and logistics/courier services.
Utilities include:
- Electricity distribution companies
- Water utilities
- City gas distribution companies
- LPG distribution entities
- Similar essential service providers
The logistics and courier category includes:
- Courier companies
- Express logistics providers
- Parcel delivery companies
- Freight companies
- Logistics service providers involved in delivering consignments
Phase-I coverage
| Sector | Examples | 1601 rollout |
|---|---|---|
| Electricity | Power distribution companies | Yes |
| Water | Water utilities | Yes |
| City gas | Gas distributors | Yes |
| LPG | LPG distributors | Yes |
| Courier | Courier companies | Yes |
| Parcel delivery | Express delivery providers | Yes |
| Freight | Freight/logistics companies | Yes |
| Banking & financial services | Banks, regulated BFSI entities | 1600 series |
| Government | Government-to-citizen calls | 1600 series |
1601 is not for promotional calls
One of the most important parts of the new framework is that 1601 numbers are intended exclusively for service and transactional voice calls.
They cannot be used for promotional voice calls.
That means a company cannot simply obtain a 1601 number and use it to make sales pitches or marketing calls.
1601 SERIES
Allowed
✓ Service calls
✓ Transactional calls
✓ Customer-related communications
Not allowed
✗ Promotional calls
✗ Marketing calls
✗ Sales pitches
Telecom operators have been instructed to obtain an undertaking from eligible entities that the numbers will be used exclusively for service and transactional calls.
Telecom operators get 90 days
TRAI has given telecom service providers 90 days to complete the onboarding and migration of eligible companies covered under the first phase.
Before allocating a 1601 number, telecom operators must verify that an entity is eligible.
The numbers will be allocated directly to eligible companies rather than to intermediaries or aggregators.
Rollout process
Eligible company
↓
Application for 1601 number
↓
Telecom operator verifies eligibility
↓
1601 number allocated
↓
Company uses it for service/transaction calls
↓
Consumer can identify trusted caller
The verification requirement is intended to prevent the numbering system itself from becoming another avenue for fraud.
Why courier calls are a major concern
Courier and parcel-delivery scams have become a common form of social engineering.
Fraudsters may tell consumers that:
- A parcel has been stopped
- A package contains illegal material
- A delivery requires an additional payment
- KYC information is missing
- An address needs to be verified
- Customs charges must be paid
- A shipment will be cancelled unless action is taken
The caller may then attempt to obtain personal or financial information.
The 1601 framework is designed to make it easier for consumers to recognise legitimate transactional calls from courier and logistics providers.
Fake courier call
Unknown 10-digit number
↓
"Your parcel has a problem"
↓
Urgency / fear
↓
Request for money or information
↓
Potential fraud
1601 framework
Verified service number
↓
Consumer can identify caller category
↓
Greater confidence
↓
Lower impersonation risk
The new numbering system does not eliminate scams, but it gives consumers an additional signal for judging whether a call is legitimate.
Why utility calls are also being targeted
Utility providers regularly contact customers about transactions and services.
Examples include:
- Electricity bill issues
- Meter-related services
- LPG delivery
- Water connections
- Gas services
- Service requests
- Payment confirmations
- Complaint resolution
These communications are important because consumers may be more willing to respond when a caller claims to represent an essential service.
A dedicated numbering series can therefore help separate genuine service calls from impersonation attempts.
1600 vs 1601: What’s the difference?
Consumers may see both numbering systems as TRAI’s trusted-call framework expands.
The basic distinction is sector-based.
| Number series | Primary users | Purpose |
|---|---|---|
| 1600 | BFSI and government entities | Service and transactional calls |
| 1601 | Other eligible sectors, initially utilities and logistics | Service and transactional calls |
| 140 | Registered entities across sectors | Promotional calls |
| Regular 10-digit numbers | General communications | Not a dedicated trusted service series |
TRAI previously mandated the 1600 series for entities regulated by RBI, SEBI and PFRDA, with the objective of improving consumer trust and reducing fraud involving service and transactional calls.
Why BFSI gets the 1600 series
Financial communications are particularly sensitive.
A fake caller claiming to represent a bank, insurance company or investment platform could potentially obtain:
- Bank credentials
- OTPs
- Card information
- Account details
- Investment information
- Personal identification information
This is why TRAI established the 1600 series for BFSI and government communications before extending the framework to other sectors.
The 1601 series now allows other important service sectors to receive a separate identity without mixing their calls with financial and government communications.
TRAI’s trusted-numbering strategy
The broader framework can be viewed as a hierarchy.
TRUSTED CALLING
TRAI
│
┌────────────┴────────────┐
▼ ▼
1600 series 1601 series
│ │
BFSI + Govt Other sectors
│ │
│ Utilities + Logistics
│ │
└────────────┬────────────┘
▼
Service/transaction calls
+
140 series
↓
Promotional calls
The goal is to separate different types of commercial communication instead of allowing promotional, transactional and service calls to blend together.
TRAI has already seen adoption of 1600 numbers
The regulator’s earlier work on the 1600 series provided the basis for expanding the system.
In December 2025, TRAI said around 570 entities had adopted the 1600 series, subscribing to more than 3,000 numbers.
An earlier November 2025 TRAI release had reported that around 485 entities had adopted the series with more than 2,800 numbers, showing the numbering system was already expanding before the latest 1601 initiative.
1600-series adoption
| TRAI update | Entities | Numbers |
|---|---|---|
| November 2025 | ~485 | 2,800+ |
| December 2025 | ~570 | 3,000+ |
This experience appears to have encouraged TRAI to expand the trusted-numbering approach to other sectors.
The bigger problem: impersonation fraud
The regulator’s concern goes beyond ordinary spam.
There is an important difference between:
spam
and
impersonation fraud.
Spam is generally unwanted communication.
Impersonation fraud involves a caller pretending to represent a trusted organisation.
Spam
↓
Unwanted call
↓
Annoyance
Impersonation
↓
Fake trusted identity
↓
Manipulation
↓
Personal/financial information
↓
Potential financial loss
The 1601 initiative specifically targets the second problem by creating a more recognisable identity for legitimate service callers.
Will 1601 completely stop fraud?
No.
The new number series is an additional authentication signal, not a guarantee that every call a consumer receives from a particular number is safe.
Consumers should still avoid:
- Sharing OTPs
- Giving card PINs
- Sharing banking passwords
- Installing unknown apps
- Clicking suspicious links
- Transferring money because of an unexpected call
- Sharing sensitive identification documents without verification
The 1601 system should therefore be viewed as one layer of protection, not a complete fraud-prevention mechanism.
Why direct allocation matters
TRAI has specifically said that 1601 numbers will be allocated directly to eligible entities rather than intermediaries or aggregators.
This is significant because a trusted numbering system would lose credibility if unrelated companies could obtain numbers through third parties.
Eligible company
↓
Direct verification
↓
Telecom operator
↓
1601 number
↓
Service call
This creates a clearer chain of responsibility.
Telecom operators become the first verification layer
The new framework puts an important responsibility on telecom operators.
They must:
- Verify the company’s eligibility.
- Allocate the 1601 number.
- Ensure the entity agrees to the permitted use.
- Support migration and onboarding.
- Ensure the number is used for service and transactional communications.
The 90-day implementation period gives operators a defined window to complete this process for the first-phase sectors.
How consumers could benefit
For ordinary mobile users, the biggest benefit is recognition.
Instead of receiving a call from an unfamiliar 10-digit number claiming to represent a courier or electricity company, consumers may increasingly see a dedicated 1601-series number.
Today
10-digit number
↓
"Is this really my courier?"
Future
1601-series number
↓
"Likely authorised service caller"
↓
Still verify before sharing sensitive information
This could make legitimate service communications easier to identify.
The impact on businesses
For legitimate businesses, the new framework could improve customer trust.
A verified service number could potentially increase the likelihood that customers answer important calls.
For example, a customer may be more willing to answer a verified utility call about:
- A service outage
- A bill
- A delivery
- A complaint
- A connection request
This could improve customer-service efficiency.
But companies will need to change their calling infrastructure
Businesses covered by the first phase may need to modify their voice-calling systems.
They could need to:
- Obtain a 1601 number
- Update outbound calling systems
- Inform customers about the new number
- Update call-centre configurations
- Ensure marketing calls use appropriate channels
- Train employees and agents
- Maintain compliance records
This means the 90-day migration period could require significant coordination between companies and telecom operators.
1601 could reduce confusion between service and promotional calls
One of TRAI’s broader objectives is to separate communications based on their purpose.
The framework increasingly creates a distinction between:
| Call type | Numbering approach |
|---|---|
| Service/transactional — BFSI & government | 1600 |
| Service/transactional — other eligible sectors | 1601 |
| Promotional communications | 140 |
| General communications | Standard numbering |
This could eventually make it easier for consumers to understand why a company is calling.
The role of 140 numbers
The 140-series is used for promotional calls by registered entities.
This creates a useful conceptual separation:
140 = promotion
1600 = financial/government service
1601 = other service/transactional calls
The system is intended to reduce the ambiguity that exists when companies use ordinary mobile numbers for multiple types of communication.
What happens after the 90-day period?
Telecom operators have been directed to complete onboarding and migration of eligible entities under Phase-I within 90 days.
TRAI’s broader plan is phase-wise, meaning the framework could eventually expand beyond utilities and logistics.
The regulator has not said that all sectors will immediately receive 1601 numbers.
Instead, it is starting with categories where service and transactional calls are particularly important.
Possible future expansion
If the initial rollout works well, other sectors could potentially be considered for later phases.
Possible categories could include:
- Healthcare
- Travel
- E-commerce
- Education
- Automotive services
- Hospitality
- Other consumer services
However, these would require further regulatory decisions and should not be assumed to be part of the current Phase-I rollout.
Why this matters for India’s digital economy
India has rapidly increased its reliance on digital services.
Consumers increasingly interact with companies through:
- Mobile apps
- Digital payments
- E-commerce
- Online banking
- Delivery services
- Utility platforms
- Digital customer support
As these services expand, voice calls remain an important part of customer communication.
That makes trusted voice identity increasingly important.
Digital economy grows
↓
More online transactions
↓
More customer-service calls
↓
More opportunities for impersonation
↓
Need for trusted caller identity
↓
1600 + 1601 framework
The cybersecurity angle
The 1601 initiative is essentially a form of identity verification at the telecom-number level.
Instead of relying entirely on consumers to recognise a company, the telecom network itself provides an additional identity signal.
This fits into a broader movement toward verified digital identities.
Traditional call
Caller → Phone number → Consumer
Trusted calling
Verified company
↓
Telecom operator
↓
Dedicated number
↓
Consumer
The approach does not replace cybersecurity controls, but it adds another layer.
What consumers should remember
The most important takeaway is simple:
A 1601 number should help identify a legitimate service or transactional caller, but consumers should still never share sensitive credentials merely because a call appears official.
If someone asks for an OTP, PIN, password or unusual payment, consumers should independently contact the organisation using its official website, app or published customer-care channel.
TRAI also maintains a mechanism for consumers to report unsolicited commercial communications to their telecom service provider.
Key numbers and facts
| Item | Detail |
|---|---|
| New number series | 1601 |
| Initial sectors | Utilities, courier and logistics |
| Rollout | Phase-I |
| Telecom operator onboarding period | 90 days |
| Permitted use | Service and transactional calls |
| Promotional calls | Not permitted |
| Allocation | Directly to eligible entities |
| Verification | Required by telecom operators |
| Existing trusted series | 1600 for BFSI and government |
| Promotional series | 140 |
What the new system could change
The impact of the 1601 series will ultimately depend on adoption.
If most major utility and logistics companies migrate successfully, consumers could become accustomed to recognising 1601 numbers.
Over time, that could create a new consumer habit:
Unknown 10-digit number → caution
1601 service number → identifiable service caller
But maintaining consumer trust will require strict enforcement.
If companies misuse the number for marketing or if fraudulent actors find ways to imitate the system, the value of the numbering framework could be weakened.
Enforcement will be critical
The success of 1601 will depend on more than allocating numbers.
TRAI and telecom operators will need to ensure that:
- Only eligible entities receive numbers
- Numbers are not used for promotions
- Misuse is detected
- Fraudulent entities cannot obtain trusted numbers
- Companies maintain accurate customer-service practices
- Consumers understand what the number means
The regulator’s requirement for verification and undertakings from eligible entities is therefore an important safeguard.
The bigger picture
TRAI’s 1601 rollout represents another step in India’s effort to clean up the voice-communication ecosystem.
The regulator is effectively trying to create a clearer distinction between:
trusted service communication, promotional communication and ordinary calls.
The 1600 series established this model for BFSI and government communications. The new 1601 series extends the approach to utilities and logistics, two sectors where consumers frequently receive important transactional calls.
If successfully implemented, the system could make it harder for fraudsters to impersonate legitimate service providers and easier for consumers to recognise genuine calls.
Conclusion
TRAI has launched the 1601-series numbering framework for service and transactional calls from non-BFSI entities, with utilities, courier and logistics companies covered in the first phase. Telecom operators have been given 90 days to complete onboarding and migration of eligible companies.
The move is designed to tackle a growing problem: fraudsters using ordinary 10-digit numbers to impersonate trusted businesses. A dedicated 1601 identity gives consumers an additional signal that a service call is coming from a verified organisation.
The framework also establishes a clear rule that 1601 numbers cannot be used for promotional voice calls. Telecom operators must verify the eligibility of companies before allocating the numbers and obtain an undertaking that the numbers will be used only for service and transactional communications.
The initiative builds on TRAI’s existing 1600-series system, which is used by BFSI and government entities. TRAI’s earlier experience with 1600 adoption provided the basis for extending trusted numbering to other sectors.
For consumers, the change could make calls from electricity providers, LPG companies, courier firms and logistics companies easier to identify. But it is important to remember that a dedicated number is not a substitute for basic fraud precautions. Consumers should never share OTPs, passwords, PINs or sensitive financial information simply because a caller appears to represent a legitimate company.
The real test will be implementation. If telecom operators successfully verify businesses, prevent misuse and educate consumers about the meaning of 1601 numbers, the system could become an important layer in India’s fight against voice-based impersonation fraud.
In the longer term, TRAI’s move could help establish a broader trusted-calling ecosystem in India, where consumers can distinguish between promotional calls, financial/government service calls and other legitimate transactional communications more easily.
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