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The international mobile subscriber identity (IMSI; / ˈ ɪ m z iː /) is a number that uniquely identifies every user of a cellular network. [1] It is stored as a 64-bit field and is sent by the mobile device to the network.
If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...
Bharat Sanchar Nigam Limited (BSNL) was incorporated on 15 September 2000. It took over the business of providing telecom services and network management from the erstwhile Central Government Departments of Telecom Services (DTS) and Telecom Operations (DTO), with effect from 1 October 2000 on a going concern basis, in early days it was known as CellOne for GSM mobile services, Excel for ...
The IMSI is often used as a key in the home location register ("subscriber database") and the MSISDN is the number normally dialed to connect a call to the mobile phone. A SIM has a unique IMSI that does not change, while the MSISDN can change in time, i.e. different MSISDNs can be associated with the SIM.
BSNL logo used until October 2024. Bharat Sanchar Nigam Limited is an Indian government enterprise and its history can be traced back to British India.The foundation of the telecommunications network in India was laid by the British sometime during the 19th century.
BSNL Mobile (2000) BSNL 92.60 55.72 4G, 3G, 2G Government of India (100%) BSNL does not directly operate in Delhi and Mumbai. [5] BSNL (VNO's) operates only in Tamil Nadu. Mahanagar Telephone Nigam Limited (1986) MTNL 1.90 0.51 3G, 2G [6] Government of India (100%) MTNL only operates in Delhi and Mumbai. [7] MTNL is in the process of being ...
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Whenever a phone attaches, or visits, a new area, the Visitor Location Register must contact the Home Location Register to obtain the details for that phone. The current cellular location of the phone (i.e., which BTS it is at) is entered into the VLR record and will be used during a process called paging when the GSM network wishes to locate ...