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mnc mobile network code

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The Mobile Network Code (MNC) is a key component of the International Mobile Subscriber Identity (IMSI), which is a globally unique identifier associated with a mobile subscriber in a cellular network. The MNC, along with the Mobile Country Code (MCC), is part of the PLMN (Public Land Mobile Network) identifier, which is used to identify the home network of a mobile subscriber. Let's explore the technical details of the MNC:

  1. Structure of IMSI:
    • An IMSI is a 15-digit numeric code that is divided into three parts: MCC, MNC, and MSIN (Mobile Subscriber Identification Number).
    • The MCC is a three-digit code that uniquely identifies the country where the subscriber's home network is located.
    • The MNC is a two or three-digit code that identifies the specific mobile carrier within the country.
  2. Mobile Network Code (MNC):
    • Length: The MNC is typically a two or three-digit code. In some cases, regulatory authorities assign a two-digit MNC, while in others, a three-digit MNC is used.
    • Uniqueness: The combination of MCC and MNC must be unique globally to identify a specific mobile network.
    • Assignment: Regulatory authorities allocate MNCs to mobile network operators within their jurisdiction. The assignment ensures that each operator has a unique identifier.
  3. Usage in Network Identification:
    • PLMN Identifier: The combination of MCC and MNC forms the PLMN identifier, which is used by mobile devices to identify and register on a specific network. For example, a PLMN identifier could be represented as "MCC-MNC."
  4. Examples:
    • An IMSI might look like this: MCC-MNC-MSIN
    • For example, if the MCC for the United States is 310 and the MNC for a specific carrier is 260, then the PLMN identifier would be "310-260."
    • The IMSI could be something like: 310-260-123456789
  5. International Roaming:
    • The IMSI, including the MCC and MNC, is essential for international roaming. When a subscriber travels to a foreign country, their mobile device uses the PLMN identifier of the visited network, allowing the home network to route calls and data appropriately.
  6. Technical Significance:
    • The MNC, along with the MCC, serves as a critical element in the initial network registration and identification processes for a mobile device.
    • It helps in routing calls, messages, and data traffic to the correct mobile network when a subscriber is within their home country or roaming internationally.

In summary, the Mobile Network Code (MNC) is a numeric identifier that, along with the Mobile Country Code (MCC), forms part of the PLMN identifier used to uniquely identify mobile networks globally. It plays a crucial role in the technical aspects of mobile network operation, facilitating network registration, routing, and international roaming.