India - TRAI overview


Telecom Regulatory Authority of India was established on 20 February 1997 by an Act of Parliament to regulate telecom services and tariffs in India. Earlier regulation of telecom services and tariffs was overseen by the Central Government.

TRAI's mission is to create and nurture conditions for growth of telecommunications in India to enable the country to have a leading role in the emerging global information society.[3]

One of its main objectives is to provide a fair and transparent environment that promotes a level playing field and facilitates fair competition in the market. TRAI regularly issues orders and directions on various subjects such as tariffs, interconnections, quality of service, Direct To Home (DTH) services and mobile number portability.

NDNC registration

Customers are not allowed to send Messages sent to numbers registered in the Indian NDNC (National Do Not Call registry). This numbers will be blocked. 

You can check the mobile number of the recipient you intend to send a message to by accessing the Telecom Commercial Communications Customer Preference portal managed by the Telecom Regulatory Authority of India registry using the following search tool:  (10 digit number without India International prefix 91)

Customers can register for a Sender Address to terminate messages provided they are for transactional messages and the recipient is expecting to receive messages from this Sender Address.  The Sender Address has to be a 6 Character Alpha Sender Address and registration requires a SMS template.

Any unregistered sender ID is fixed to a local shortcode as required by Indian regulations, whether the destination number is registered on the NDNC list or not.

Permitted Hours of Delivery

Indian Operators do not allow message delivery outside of the hours between 9am to 9pm. Messages submitted after 9pm we will attempt to send, but due to local regulations, these messages will be queued until the morning

Anti-spam measures

Number of messages to the same number limitations:

  • No more than 6 messages with the same sender or text to the same number within an hour
  • Recipient may not be able to receive more than a total of 200 SMS per day across all incoming connections

Political Reasons

Messages towards Jammu and Kashmir networks (example, 405/55 - Airtel J&K) will be blocked by the government due to political sensitivity.

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