The relationship between Mobile Network Codes (MNCs) and phone numbers is indirect but crucial for the functioning of mobile networks. MNCs are not part of the dialable phone number itself but play a vital role in identifying the specific mobile network operator that a phone number belongs to.
Here's a breakdown of their relationship:
1. Identification of the Mobile Network Operator:
An MNC is a two or three-digit code that uniquely identifies a specific mobile network operator within a country.
Each mobile operator in Bangladesh, such as Grameenphone, Robi, Banglalink, Airtel, and Teletalk, has its own unique MNC.
The MNC is combined with the Mobile Country Code (MCC), which for Bangladesh is 470, to create a unique identifier for each mobile network operator globally. This MCC-MNC combination is essential for international roaming and network identification.
2. Part of the IMSI:
The MNC is a component of the International Mobile Subscriber Identity (IMSI). The IMSI is a unique number stored on the SIM card that identifies a mobile subscriber within their home network.
The IMSI typically consists of three parts:
MCC (Mobile Country Code): Identifies the country of the mobile subscriber's home network (470 for Bangladesh).
MNC (Mobile Network Code): Identifies the specific mobile network operator within that country (e.g., Grameenphone, Robi).
MSIN (Mobile Subscriber Identification Number): A unique algeria phone number data number assigned by the mobile operator to identify the individual subscriber.
While the IMSI contains the MNC, it is not the phone number itself. The IMSI is used by the network for authentication and identification of the subscriber.
3. Roaming:
When a mobile phone roams onto a network in another country or even a different network within the same country, the MCC and MNC of the visited network are used to identify that network.
This information is crucial for billing and ensuring that calls and messages are correctly routed back to the subscriber's home network.
4. Network Selection:
When a mobile phone is powered on, it scans for available mobile networks. The MCC and MNC broadcast by these networks allow the phone to identify the operators and present them to the user for manual or automatic selection.
5. Not Part of the Dialable Number:
It's important to emphasize that the MNC is not part of the phone number that you dial to make a call or the number assigned to a specific subscriber (e.g., +880 17XXXXXXXX).
The phone number is a separate identifier used for routing calls and messages to a specific user.
In the context of Dhaka, Bangladesh:
When you dial a mobile phone number in Dhaka (e.g., starting with 017, 019, etc.), you are using the subscriber's unique phone number. The network to which that number is assigned (Grameenphone, Banglalink, etc.) is identified by its specific MNC, which is embedded in the SIM card's IMSI and used by the mobile network infrastructure for routing and identification purposes, but not by the end-user during dialing.
In essence, the MNC operates behind the scenes, within the mobile network infrastructure and on the SIM card, to ensure that your phone connects to the correct operator and that calls and messages are routed appropriately. It's a fundamental identifier for the mobile network, distinct from the publicly dialable phone number assigned to a subscriber. The MCC and MNC together are like the "postal code" for a mobile network, ensuring global connectivity and proper routing.
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