It depends on the capacity of the networks server. In the UK we recently had an overhaul of the dialling codes system, as they were running out of codes. With the introduction of better computer systems, BT was able to increase the capacity of the network (using the new codes) to provide enough capacity for at least the next 20 years.
It varies from country to country and also depends on the length of the number.
In the United Kingdom, the local telephone number without an area code normally cannot begin with '0', '1' or '999' to avoid clashes with area codes (beginning with '0'), special services (beginning with '1') or the emergency operator.
There are also technical issues with the way older, landline phone networks traditionally process numbers digit-by-digit sequentially, rather than analysing the whole number at once. This rules out having numbers of different lengths that begin with the same digits because, for example, if you had both 23456 and 234567 in the same area, the system would not be able to tell if somebody dialling 2-3-4-5-6 should be connected to the number '23456' or if it should carry on waiting for another digit in case they wanted 234567.
Theoretically, this allows the following combinations to be used:
In practice, the actual availability of numbers is further complicated by the limitations of network technology and the need to issue numbers to phone companies in blocks of at least 1,000 rather than individually. For example, because the block of 10,000 numbers from (029) 2221 0000 to (029) 2221 9999 is reserved for Sky's customers in Cardiff, these numbers can't be used by any other phone company, even if Sky is not actually using them.
It depends first and foremost on how many digits in a phone number, but also on restrictions for various digit combinations.
In the United States, the first digit of a 7-digit local phone number cannot be 0 or 1, and the first three digits cannot be certain reserved combinations like 411, 911, or 950. The result is that there are a bit less than 8 million possible phone numbers per area code.
Within the North American telephone system (USA, Canada, and certain Caribbean-ish islands), telephone numbers are uniformly 7 digits within each area code.
There are 10 million possible 7-digit numbers; however, the quantity of possible phone numbers is lower than that, because not all 7-digit numbers are valid telephone numbers. In particular, the first digit cannot be a 0 or a 1; that immediately drops the number to 8 million. There are other combinations that are not permitted; for example, the first three digits cannot be 911. The exact list of unassignable numbers varies from location to location, but 7.8 million is a reasonable approximation of the quantity of potential telephone numbers in an area code.
8,000,000 million telephone numbers are possible with these conditions, corresponding to the numbers 2,000,000 - 9,999,999. Many countries have forced dialing of the area code now, creating telephone numbers with a minimum of 10 digits. This means there are 8 million possible telephone numbers in each area code. (area code of 3 digits long).
10,000
There are many free telephone numbers available to you. The best place to find one of these numbers is your phone company.
7
Telephone numbers in Turkey consist of the telephone country code +90, followed by a three-digit area code and a 7-digit subscriber number.
The exact number of telephone numbers in the telephone directory is impossible to know because there are several directories put out by different companies. However, there are thousands and thousands of numbers with millions and millions more in cell phones.
5 digit telephone numbers having at least one of their digits repeated is = total possible 5 digit telephone numbers - 5 digit telephone numbers without any digit being repeated. =(10*10*10*10*10)-(10*9*8*7*6) =100000-30240 =69760
possible, this is for blind people so they can determined the numbers they wanted to push.
In the North American system with 3-digit area codes and 7-digit local numbers, there are slightly less than 8 million possible telephone numbers per area code, so with two area codes you have more than 15 million possible numbers. However, only a fraction of those numbers will be in use at any given time.
0845 numbers are 'non-geographic' numbers, which means that the number is not tied to a specific location. 0845 numbers are usually owned by large companies, banks and other businesses. It is impossible to know how many 0845 numbers exist, as telephone numbers are not released due to privacy reasons.
Just 1.
The duration of Talking Telephone Numbers is 1800.0 seconds.