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The New Denver and East Denver telephone numbering plan describes the allocation of telephone numbers in New Denver and East Denver.

Present numbering plan
The standard telephone number consists of ten digits, of which the first is '0'.

Geographical numbers consist of a four-digit area code and a six-digit local phone number for most of the plan. The only exception is in when the third digit of the number is 0, where there is a three-digit area code and a seven-digit local phone number. In both types of numbering, the first three digits state the exchange of which the number is located.

Non-geographical numbers are also ten digits long, but they always consist of a four digit service identifier code (the equalivent of an area code), and a six digit number.

Overview
The following is the numbering plan in domestic format. Geographical numbers use an open dialling plan: if the caller's phone shares the same area prefix as the receiver, the prefix may be omitted. Non-geographical numbers use a closed dialling plan: you have to dial every number, even for phones on the same service identifier code.

Internationally the first 0 is replaced by the country code (i.e. +698). End-user numbers are 10 digits long, conventionally written in the form 0x0 xxxx xxx for the large geographical area codes and 0xxx xxx xxx for other numbers.


 * 00      International access
 * 01      Landlines - New Denver - Denver Island
 * 02	Landlines - New Denver - Little Denver Island and other offshore islands
 * 03	Landlines - East Denver
 * 04	Non-geographical normal-rate numbers
 * 05	Not used
 * 06      Alternate phone services (Internet access, EFTPOS, VoIP, etc)
 * 07	Mobile phones and pagers
 * 08      Toll-free numbers
 * 09	Premium-rate numbers
 * 1       Operator services [+2D or +3D]
 * 2~9     Local phone numbers
 * *8      Text message numbers - free or normal rates [+4D]
 * *9      Text message numbers - premium rate [+4D]

Geographical Numbers
Geographical areas are identified by their area code and the first three digits of the local number.

0x0 area codes
The 0x0 area codes are used in the three major cities on the numbering plan. These cities have seven digit numbers instead of the regular six digits, mainly due to the size of the cities.

0xxx area codes
0xxx area codes are used outside the big three cities. Phone numbers on these area codes have a six digit local numbers.

Local Numbers
Local numbers are six digits on 0xxx area codes and seven digits on 0x0 area codes. Local numbers begin with a digit between 2 and 9 inclusive. The second digit of a 0xxx and both the second and third digit of a 0x0 number cannot be 0. Also, if the first digit is 9, and the second digit cannot be 9.

Therefore, 673 647, 594 892, 8399 374, 9223 843, 340 482, and 934 783 are all valid local numbers, but 023 483, 191 385, 203 473, 5608 583, and 996 343 are all invalid local numbers.

Mobile Phone Numbers
Mobile phone numbers come in the format 07yz xxx xxx where y is the service provider code, and z is any digit except 0.

There is no mobile number portability on the numbering plan, but you can get a similar phone number (subject to availablity) when you switch service provider.

Alternate phone service numbers
These numbers are used for services such as Internet Access, EFTPOS, and VoIP. Numers come in the format 06yx xxx xxx, where y is the service type.

Free-phone, NGNR numbers, and Premium-rate numbers
Free-phone, non-geographical normal-rate (NGNR) numbers and premium-rate numbers come in the format 08yx xxx xxx, 04yx xxx xxx and 09yz xxx xxx respectivaly, where y is the service provider, and z is the type of service.

Operator and Network numbers
Operator numbers begin with 1 and are followed by two or three digits. The nature of the number determines it's position.

Emergency Numbers
The main emergency number is 122. Other emergency numbers take the form of 127x for major services and 129xx for more minor services. *122 allows users to communicate with the emergency services by text messaging.

Text Messaging Services
Text message numbers begin with * and are followed by a 8 or 9, and an additional four digits (e.g. *80701, *90701). *8 numbers are used for text services that are free or charged at normal rates. *9 numbers are used for text services charged at premium rates.

Fictitious Numbers
Fictitious numbers in the numbeing plan come in the form of 0xxx x01 xxx or 0x0 x01x xxx. Most fictitious numbers used in a fixed location sustitute the x's for relevent numbers. For example, a fictitious number in Central Citrus City will come up as 020 401 xxxx. If the number is for a fictitious location, they may choose any legal digits to fit the number.

History
Phone numbers came around when automatic exchanges were installed in Cycle Aquality (1919), Citrus (1920), New Northampton (1920), Superior (1921), Cakeville (1921), and New Southampton (1921).

At the time, New Denver and East Denver had seperate numbering plans, but both there numbering plans were similar: the operator was on 100, directory on 105 network faults on 115 and emergency services were on 122.

By the mid-1950's, most people could dial anyone else on their exchange automatically. Phone Numbers on individual exchanges ranged from 3 to 5 digits in length in New Denver, and from 2 to 6 digits in length in East Denver. To call anyone outside your exchange in both countries, you had to make a long distance call by dialling 0.

In 1952, both Cycle Aquality and Citrus adopted a linked numbering scheme, which meant that anyone can call someone on another exchange without using the operator. What the changes meant was that previously, one calling Hollybridge from Citrus Central had to dial the operator and have them place the call, and vice versa had to do the same. Now someone could call Hollybridge simply by dialling 49-xxxx, and someone could call Citrus Central by dialling 2-xxxxx.

In the 1960's, Subscriber Trunk Dialling was introduced in both countries. In New Denver, it was introduced in 1964, where people on the Cycle Aquality exchange could dial people on the South Lake exchange by simply dialling 0-SLK (0755) followed by the local number, and vice versa using 0-CY (029). In both cities, the trunk operator was moved to 01. In East Denver, it was introduced in 1965, where people in New Northampton cold dial nearby Berkeley by simply dialling 042, and vice versa using 01. The long-distance operator was intergrated with the local operator on 100.

By 1970, STD had rolled out to about 50% of all the exchanges. In New Denver, you dialled 0, followed by the exchange mnemonic (between 3 and 6 digits in length), which was an abreviated form of the exchange name. In East Denver, exchange codes were also variable, with 0, followed by 1 to 5 digits, but they were all numerals.

In 1971, New Denver's long distance operator moved to 01100, and 0100 became the international access code. Previously, you had to go through the international operator (150) to call anyone outside New Denver. Also installed was a East Denver direct dial access code. One in New Denver who wanted to call New Northampton could simply dial 0109 1 xxx xxx. East Denver adopted 0010 as its international access code, and East Denver could direct dial New Denver by dialling 0019 (e.g. someone calling Cycle Aquality would dial 0019 29 xxx xxx).

In 1978, it was decided between the two countries that they would combine the two dialling plans into the one, and with the imminent introduction of mobile telephones, it called for an entire change to the numbering plan. It was decided that East Denver would relinquish the +699 code and move over to New Denver's +698. The new numbering plan would involve moving STD codes to a logical sequence, and introducing linked numbering schemes in more areas.

From 1980, the numbering plan was thus:

Numbers on the new numbering plan came in the format 0xx xxx xxx, 0xxx xx xxx, 0xxxx xxxx or 0xxxxx xxx.

In 1988, the operator services on the 011xx plan were moved to 1xx as a result of intergration of local and national services.

Into the 1990's, the introduction of direct-dial lines, faxes, more mobile phones, internet, and Eftpos put some strain on the numbering plan. In 1991, a new telephone numbering plan was drawn, but was not implemented.

Between 1993 and 1996, several large cities, and some smaller regions, changed their area codes to increase numbering. The new numbers were nine digits after the initial zero. Most of the changes followed the 1991 plan.

The changes were

In 2002, it was decided that the rest of the numbering plan would change to alleviate the existing cramped numbering plan. Promotion of the change started in January 2004, and between November 2004 and November 2006, the number plan was changed over fully to today's plan.