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The SIM Application Toolkit consists of a set of commands programmed into the SIM which define how the SIM should interact directly with the outside world and initiates commands independently of the handset and the network. [4] This enables the SIM to build up an interactive exchange between a network application and the end user and access, or ...
In previous versions of the document, [19] [20] network numbers were 8-bit numbers rather than the 32-bit numbers used in IPv4. At that time, three networks were added that were not listed earlier: 42.rrr.rrr.rrr, 43.rrr.rrr.rrr, and 44.rrr.rrr.rrr. The relevant portion of RFC 790 is reproduced here with minor changes:
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.
All can store a maximum of 250 contacts on the SIM, but while the 32 KB has room for 33 Mobile country code (MCCs) or network identifiers, the 64 KB version has room for 80 MNCs. [1] This is used by network operators to store data on preferred networks, mostly used when the SIM is not in its home network but is roaming. The network operator ...
The Broadband Global Area Network (BGAN), Iridium and Thuraya satellite phone networks all use IMEI numbers on their transceiver units as well as SIM cards in much the same way as GSM phones do. The Iridium 9601 modem relies solely on its IMEI number for identification and uses no SIM card; however, Iridium is a proprietary network and the ...
The eSIM describes the functionality in the SIM, not the physical size of the SIM - and there are eSIMs in many formats (2FF, 3FF, 4FF, MFF). GSMA have also developed a compliance framework [ 10 ] for eSIM devices, eUICCs, and subscription management products - to help with interoperability and security for products supporting eSIM.
CC = Country Code NDC = National Destination Code, identifies one or part of a PLMN SN = Subscriber Number. In the GSM variant PCS 1900, MSISDN is built up as MSISDN = CC + NPA + SN CC = Country Code NPA = Number Planning Area SN = Subscriber Number. The country code identifies a country or geographical area, and may be between 1-3 digits.
On recent phone models running Android software, the phone will display a message saying "SIM network unlock PIN" or "Enter Network Lock Control Key" if network locked. Windows phones will display the message, "This SIM card can only be used on specific networks. Contact your customer service center for the unlock code".