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Q: Why are some phone numbers 11 digits?
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Why cellphone numbers have 10 digits?

Actually they have 11 digits - At least they do in the UK ! It's just the form agreed by the mobile phone companies. For example 07xxx defines the network the phone is locked to and the remaining six digits identify the individual phone.


How many numbers is ten digits?

10 digits are numbers in the billions.


What prime numbers are still prime numbers when their digits are reversed?

Some of them are: 11 13 17 37 and 79


Do all foreign phone numbers have 10 digits like US numbers do?

No! The number of digits varies by country, and may vary within a country. International standards restrict the total phone number length including country code to 15 digits maximum (which would be 11 digits for the US and Canada including our country code +1), but what happens after the country code is up to that country. 10-digit and 9-digit phone numbers within a country are common. Smaller countries may have fewer digits: Iceland has 7-digit numbers. China uses 10 digits for landlines but 11 digits for mobile phones; it is effectively in a slow migration to 11 digits. Germany until a few years ago had variable length numbers from 7 to 12 digits, the subscriber (local) part being as short as 4 digits for old numbers and longer for new numbers, but since 2010 uses 10 or 11 digits total. Most countries use 2-digit area codes (with 7 or 8-digit local subscriber numbers), but that varies too, with some using 3 or 4-digit area codes. The UK uses a variable length area code: Even though UK phone numbers are 10 digits almost everywhere (9 digits for certain old numbers), the city code portion can be from 2 to 6 digits, so that large cities have a 2-digit city code and 8-digit local portion, while smaller towns have longer city codes and shorter local numbers.


What is mobile phone numbering system?

It depends on the country you're in. Here in the UK, mobile (and most land-line) numbers consist of 11 digits.


What is a prime number with two identical digits?

11 is the only prime number with identical digits. After 11 all numbers with identical digits can be divided by atleast 11 or 3.


How many digits are on a phone number in India?

Still 11


Is 203151234 an international phone number?

There's no way of telling - that number appears to have some digits missing. Most countries use 11 digits in their numbers (including area codes). In addition to that - they have 2 or 3 digits for the country code. For example - A mobile (cell) phone number in the UK would be displayed as +44 7xxx 123 4567 (the spaces are just for clarity)... +44 is the internatonal access code for the UK, then mobile numbers start with a 7. The number you're asking about only has 9 digits.


What is the rule for numbers divisible by 11?

The sum of the digits in odd position minus the sum of the digits in even position is divisible by 11.


What is 11 D in a M P N?

11 Digits in a Mobil Phone Number


Why do you receive calls from a number with only 8 or 9 digits?

I don't, I get lots from numbers with 11 digits.


Find all the 2 digit numbers whose digits total 11?

All two digit numbers which the digits add up to 11 are :- 29, 38, 47, 56, 65, 74, 83 & 92.