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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 ...
A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone ...
Over-the-air provisioning (OTAP) is a form of OTA update by which cellular network operators can remotely provision a mobile phone (termed a client or mobile station in industry parlance) and update the cellular network settings stored on its SIM card. This can occur at any time while a phone is turned on.
In 2G networks, the SIM card and SIM application were bound together, so that "www SIM card" could mean the physical card, or any physical card with the SIM application. In a GSM network, the UICC contains a SIM application and in a UMTS network, it contains a USIM application. A UICC may contain several applications, making it possible for the ...
US Mobile is an American mobile virtual network operator (MVNO) that uses the T-Mobile, Verizon Wireless, and AT&T networks (branded as "Light Speed", "Warp", and "Dark Star" respectively) to provide talk, text, and data services to their customers. US Mobile has over 1,000,000 customers as of 2024.
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United States Cellular Corporation (doing business as UScellular and formerly known as U.S. Cellular) is an American mobile network operator. Its stock is publicly traded, but Telephone and Data Systems Inc. owns a controlling stake (83% economic and 96% voting power).
An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning ; end-users can change mobile network operators without the need to physically swap a SIM from the device.