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The other aspects being that the SIM is now structured into "domains" that separate the operator profile from the security and application "domains". In practise "eSIM upgrade" in the form of a normal SIM card [4] is possible (using the Android 9 eSIM APIs) or eSIM can be included into an SOC. [5]
According to its very low price (starting from 20 to €30 /$) the F3/F3c was mainly sold with prepaid (pay-as-you-go) SIM cards and it seems that the sellers often (but not always) implemented a SIM-lock. However, for slightly more (starting at ca. €30) it could also be bought without SIM-lock or card, giving full freedom to choose any provider.
A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
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 ...
The first iPhone models to not have a SIM card tray and work exclusively with eSIM were the iPhone 14 and iPhone 14 Pro, announced in 2022. [20] Outside the United States, all iPhone models continue to be sold with support for physical SIM cards, but the iPad Air (6th generation) , iPad Pro (7th generation) , and iPad Mini (7th generation ...
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The phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.
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 the mobile phone. Every SIM card contains a secret key, called the Ki, which is used to provide authentication and encryption services.
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