You are here
Home > Telecom > Mobile Numbering System in India

Mobile Numbering System in India

Telecom industry in India is vastly on verge by the youths. Lakhs and lakhs of new unique identities settle into operators’ database every new day. People from any state let that be poor or wealthy uses smartphone which connects them into this tragic world. A place where we can gain knowledge, share, virtualize and live our lifestyle as we wish to. No particular and definite law is applicable up to certain limits.

We thank Sir Alexander Graham Bell for his application of creativity into that time old telegraph system. However, this has now all gone up to a whole new level. Every recognised nation in the world is now connected through under sea cables and wireless satellite. Therefore, we are just few touches/buttons away to a person. Still an unthought question is how does this whole system of communication function?

Functionality of Telecommunication in India:

mobile network

Let me tell you every nation has different versions of telecom system. Some have latest advanced ones, minors have outdated ones and few have all of them. All the new ones are backward compatible thus sustaining stability in market. In India, US, we use 10 digit mobile number system. Most toll-free services are of this family. However, some special services and offerings are provided through short numbers of 5 digit or even lower in India. Likewise, emergency services are of 3 digits(like 100, 101 etc.). In few countries they have primarily lesser digits subject to demand and population.

Format of mobile number in India is +91 XXXX RRRRRR. Here XXXX is code assigned to telecom operator by TRAI to a particular circle(a.k.a STD series). The rest RRRRRR is the random code by the operator itself. For example “7001” is the code assigned to Jio for West Bengal circle and “7004” for Bihar and Jharkhand circle. The rest 6 digits is a random generation by Jio. Every financial season or the other, new batches of codes are assigned to operators.


Recognition of a mobile number’s telecom were earlier based on code assignment history. After the flexibility of porting, history of activation and last recharge is minutely considered to accurately detect the actual operator.

To port your existing mobile number to a new operator simply SMS PORT <your number> to 1900(TRAI’s central number) from it. You will receive a port code within seconds. The new telecom will require this code to authorise your porting.

Telecom Circles in India:

With such a huge population and rapid digitalization, regulatory has segregated different telecom circles in the nation. Their border and structure resembles with the present system of states but many have exceptions respective of locality and usability.


Telecom circles dedicatedly serve metro cities from their state to cater the need of high density living.

  • Delhi
  • Mumbai
  • Kolkata


Formally based on state boundaries, its now based on locality and usability statistics of people.

Telecom Circles
Credit: MapsofIndia
  • Andhra Pradesh & Telangana
  • Assam
  • Bihar & Jharkhand
  • Gujarat & Daman & Diu
  • Haryana
  • Himachal Pradesh
  • Jammu and Kashmir
  • Karnataka
  • Kerala(includes Lakshadweep)
  • Madhya Pradesh & Chhattisgarh
  • Maharashtra & Goa(excluding Mumbai)
  • North East(includes every North Eastern States)
  • Odisha
  • Punjab
  • Rajasthan
  • Tamil Nadu(includes Chennai)
  • Uttar Pradesh(East)
  • Uttar Pradesh(West)(includes Uttarakhand)
  • West Bengal(excluding Kolkata)(including Sikkim and Andaman-Nicobar)

State Circles are further classified into A, B and C categories. ‘A’ category circles have the largest population coverage while ‘C’ have the lowest. Sincerely, ‘B’ ones just perfectly sit in between. Thus, telecom operators prefer to invest more in metro, A and B category circles. Chennai metro circle was merged with Tamil Nadu in 2005.

Each telecom circle has its own switching station to support STD(Subscriber Trunk Dialling) calls. For ISD or International calls, ‘+91’ is India’s identity. Whenever you call someone, first goes the country code in process and thereafter the STD series assigned to operators(in case of India). PoI(Point of Interconnection) is necessary during this operation to deliver the request at right terminal(receiver’s phone number). Therefore, you might hear “route/line busy” in absence of PoI specially in metro cities.

Types of Networks in India:

Having such a dense population average, we have almost every type of network from GSM to 4G LTE. 5G MIMO is expected to strike the market very soon. With the arrival of 2G network, people got a chance to surf the internet over their Nokia feature phone for the first time. Though slow, it somewhere created the hunger for futuristic needs. The switch over from 2G to 3G kind of felt revolutionary cause of difference in speed we experienced. Now we are in the era of 4G LTE with cheapest possible data rates ever.

network architecture

During the typical 2G period, a tower had a very limited capacity and bandwidth to deliver. New 3G network weren’t even designed for calls. Therefore, to meet the demand came the use of 4G VoLTE. This is faster, more efficient and smoother network than ever. You won’t even need to turn off your data to make or receive a call unlike before. Everything goes through data itself and therefore response is very quick and of very high clarity. Jio is the first operator in India to provide nationwide VoLTE services at name cheap rates.

Please follow and like us:
Interested in blogging specifically in the emerging field of technology and science. I am passionate about my dreams to web development and programming.

Leave a Reply

Follow by Email