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KDDI's au IC-Card Sierra Wireless AirCard 555R PC Card wireless modem for the China Unicom network with R-UIM interface (extension at the front). Removable User Identity Module (R-UIM, usually pronounced as "R-yuim") is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks.
The SIM card is designed to prevent someone from getting the K i by using the smart-card interface. Instead, the SIM card provides a function, Run GSM Algorithm, that the phone uses to pass data to the SIM card to be signed with the K i. This, by design, makes using the SIM card mandatory unless the K i can be extracted from the SIM card, or ...
SIM Application Toolkit (STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being ...
The US variants also force a reboot each time the user switches eSIMs, while other models do not, because the CSC codes correspond to a single carrier. If a phone is bought directly from a carrier with a SIM lock, the phone can only add eSIMs from the same carrier as the one on the physical SIM card, even after a carrier unlock.
A mobile phone signal (also known as reception and service) is the signal strength (measured in dBm) received by a mobile phone from a cellular network (on the downlink). Depending on various factors, such as proximity to a tower , any obstructions such as buildings or trees, etc. this signal strength will vary.
In a mobile telephone communication system, a mobile phone number generally corresponds to a SIM card. As soon as a mobile phone user combines the SIM card with the mobile phone, the system is immediately able to identify the user, providing the kind of transmission services and data gathering services required for billing purposes.
A Secure Access Module (SAM), also known as a Secure Application Module, is a piece of cryptographic hardware typically used by smart card card readers to perform mutual key authentication. [ 1 ] [ 2 ] [ 3 ] SAMs can be used to manage access in a variety of contexts, such as public transport fare collection and point of sale devices.
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 ...