Numbering and addressing is not only one of the most important fundamental functions of a network but it also is the sole means of identifying not just the subscriber but also the network itself. That is why telecom numbering plans are considered as national resources and in Pakistan these resources have been entrusted to PTA.
CERTAIN BASIC PARAMETERS AND FACTS IN THIS REGARD NEED TO BE UNDERSTOOD: As a result of two new Cellular Mobile Telecom Operators (CMTOs) in 2004 and expansion carried out by all CMTOs, the subscriber density has not just grown rapidly but continues to grow.
The present annual increase of subscribers between 12 to 18 million may increase further with the expected growth in the national economy, so that a few years hence, the annual increase of subscribers may well go beyond 20 million.
To differentiate between various telecommunication services, such as cellular mobile, fixed line and wireless local loop (WLL), telephone numbers are segregated in different categories.
While PTA is the sole agency to regulate and control the telecom industry in Pakistan, it is also a member of International Telecommunication Union (ITU) and is bound to adhere to the international standards laid down by it.
ITU-T standards E-164 lays down the geographical numbering plan including that of local loop and cellular mobile operators. The latter are identified by 4-digit separate access code known as National Destination Code (NDC). It can be numerically explained as 03xx followed by a seven digit subscriber number with numbers ranging from 0 to 9.
The first fifty codes are reserved for cellular mobile operators. It, therefore, follows that a subscriber number consists of 11-digits, ie NDC and a seven digit number starting from 2 to 9.
• The allotment of cellular mobile numbers in Pakistan is based on geographical boundaries that limit the utilization to 50-60% of the numbering space available against each NDC. Thus the capacity of each access code to accommodate subscribers (excluding levels "0"and "1") is 8 million.
The CMTOs, thus, have no choice but to utilize multiple access codes in order to accommodate the increasing number of subscribers. Keeping in view the rate of increase mentioned above and the number of subscribers at present, something needed to be done in order to allay the situation.
The studies and consultations started in 2007. A consultation paper by PTA was circulated to all stake holders and after extensive discussions and examinations of various options a consensus emerged and the plan that was devised is known as '7 to 8 Mobile Number Migration Plan'. Conceptually this plan is very simple and its implementation guarantees the results that are desired. The plan was to be implemented in four phases as per the international practice which includes:
1. 1st Phase. Public Awareness Campaign from January to March 2008.
2. 2nd Phase. Parallel Operations from April to June 2008. During this phase both the old and the new numbers can be used.
3. 3rd Phase. Announcement Phase from July to September 2008.
4. 4th Phase. Sterilization Process thereafter.
The 11-digit dialing format of subscribers of Mobilink, Ufone, Telenor and Warid will remain the same. To illustrate the change, let us take the mobile number of this scribe: 0300-5551390. The planned migration of number means only that of the access code or NDC, as explained above, will change to 030 and the subscriber number will have the last digit of the NDC added as the first digit, so that the entire number would read as 030-05551390.
No change as far as I am concerned, is there? This will hold good for the numbers of Mobilink, Ufone, Telenor and Warid. So, where is the change? One may ask. The change indicated above is to be implemented at the core network, which is the job of the network operator and the subscriber does not have to lose any sleep over it.
There will, however, be a change for the subscribers of CMPAK, Instaphone and SCOM (for AJK and Northern Areas). The total number of subscribers of the three is around 2 million and out of a total subscriber base of 80 million, this constitutes only 2.5%.
Thus, the plan envisages least amount of bother to the subscribers. During the Parallel Operation Phase (up to 30 June 2008), new numbers of subscribers shall appear on the called party's CLI thus enabling its memorizing and storing. The details of the changes with respect to these three mobile operators are best described in the table below:
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Old Code New Code
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0304 0314
0320 0364
0335 0355
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The necessary changes are made in the centralized database that is maintained by Pakistan Mobile Database Guarantees Ltd used for MNP. The modifications have already been carried out successfully for all fixed line, WLL, long distance international and mobile networks.
The 7 to 8 Mobile Number Migration Plan has several advantages, the most important being that each single NDC (one per operator) has a capacity of 100 million numbers and this expansion in capacity is sufficient to cater to the projected increase in the number of subscribers for the next two decades.