## Are all phone numbers 10 digits?

Mobile phone numbers always consist of 10 digits.

The first digit of the “zone prefix” of a mobile number is always ‘4’.

Then follows 2 digits indicating to which Mobile Operator’s pool the number originally belonged when it was taken into usage..

## Why are phone numbers 10 digits?

All about Numbers Thus, if phone numbers were to have 2 digits, how many different number combinations would be available? … In the same fashion, if phone numbers were to have 9 digits, this would only satisfy 1,000 million (100 crore) subscribers. Hence, the 10-digit mobile number.

## What year did phone numbers become 10 digits?

And to the 10-digit coding system the telecom giant introduced to, and on behalf of, the American public half a century ago. Which brings us back to 1962. Bell had begun rolling out its numeric system, the North American Numbering Plan, a decade earlier.

## How many digits are there in American phone number?

11 digitsPhone numbers in the United States typically consist of 11 digits — the 1-digit country code, a 3-digit area code and a 7-digit telephone number.