Why do We Have A 10-Digit Mobile Number?

Ever wondered why we have 10-Digit mobile numbers and not 9-digit or 8-digit! In the initial stages, telecom industries always used to provide us with numbers starting with 9. If you still have a 7 to 8-year-old Mobile number, there are high chances it must be starting from 9.

With the passing time, we are witnessing that numbers are now also starting with 8, 7, and 6. But the 10-digit number has been a constant. Well, in this article we have tried to reveal the truth that is the exact reason numbers have 10-digits.

Why do We Have a 10-digit Mobile Number?

Why do We Have A 10-Digit Mobile Number?
Why do We Have A 10-Digit Mobile Number?

The first and foremost thing that anybody needs to know is the fact that the total number of digits of a mobile depends mainly on how many people live in that particular country. Laws are often made based on the number of population in a country. The current estimated population of India is 135 crore.

The number of digits of a phone number decides the maximum number of mobile phones we can have without dialing country code, which is 91 for India. In case if we had a 9-digit mobile number, the maximum number of cell numbers would have been 109, which is a maximum of 1000 million or 100 crore subscribers. Since our population is advancing towards 150 crores, we cannot afford to have 9-digit mobile numbers.

The population of India has already crossed the mark of 1 billion, so there is no chance of making mobile numbers less than 10 digits. It has been assumed that every citizen of the country possesses a mobile phone—one of the primary reasons why India settled for a 10-digit mobile number.

Therefore, by keeping 10-digit numbers, we can get a total combination of 1,000 crore unique numbers. Got the idea behind it? Or are you still confused! It is essential to understand the permutation and combination for making 10-digit Mobile numbers.

Let’s try to understand more simply:

Why do We Have A 10-Digit Mobile Number?- Infomance
Why do We Have A 10-Digit Mobile Number?

Suppose for a moment that you have 3 pairs of Pants and 4 Shirts. What is the total number of combinations that you shall get able to wear? 12 combinations right. In the same way from 10 digit cell numbers, we have 10 billion combinations which amount to 1000 crore subscribers.

As per the use of Smartphones is rising, every customer has started using 2-sim cards, the authorities of the telecom industry, as well as the Government, got a little tense. Love, the authorities made it mandatory to make M2M mobile numbers which in no case shall be used by humans.

Is there any need to worry about 13-digit numbers?

Why do We Have A 10-Digit Mobile Number?
Why do We Have A 10-Digit Mobile Number?

Certainly not as per Times of India reports. You must have encountered a situation where you have got a call from a 13- digit number where you listen to a pre-recorded voice. These numbers are used in different devices such as swipe machines, cars, electricity meters, and several other fields

Do all countries have 10-digit mobile numbers?

The answer is no. I have already mentioned above that the total digit depends on the number of the population of a country. Following this rule, Some countries have a 6-digit number like Niue, including the country code, because the reason is it is more than enough for them. Countries like China are already up to 12-digit mobile numbers because of the rising population in their country.


Looking at these figures, we can infer that India might have 11 digits or 12 digits shortly because of its rising population. Hope you understand now why India has 10-digit mobile numbers and some countries have less, and some countries have more.

In 2003, the Department of Telecommunication in India had implemented the 10-digit mobile numbers, which shall be able to meet the needs of 30 long years. The current 10- digit numbering scheme, only a maximum of 1 billion numbers can be issued. There are high chances that India would cross this mark in the next couple of years.

Disclaimer: This information is covered based on the latest research and development available. However, it may not fully reflect all current aspects of the subject matter.

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