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Tesco Mobile was established in May 2003 [4] and launched pre-paid mobile services in Tesco stores and online by the end of the year. [5] In January 2014, the network in the United Kingdom started offering 4G service, for its pay monthly and SIM only customers at no extra cost, extending the service to pay as you go customers in July of that year.
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 ...
SIM-only contracts can be pre-pay - where the subscriber buys credit before use (often called pay as you go, abbreviated to PAYG), or post-pay, where the subscriber pays in arrears, typically monthly. Within a SIM-only contract, the mobile network provider supplies their customer with just one piece of hardware, a SIM card, which includes an ...
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 ...
On some pay as you go networks, such as Tesco Mobile, once a user performs an action that costs money, the user sees a USSD message with their new balance. USSD can also be used to refill the balance on the user's SIM card and to deliver one-time passwords or PIN codes.
The (U)SIM interface is the connecting point of the mobile phone and the UICC with its SIM or USIM application. Standardisation of the (U)SIM interface [ edit ]
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 standard ISO/IEC 7816 also regulates data exchange protocols and some aspects of work with other smart card data. [1] [2] Such cards are used for holder authorization for reception of certain services, such as bank account access for payments realization, use of prepaid mobile services, etc. The most widespread contact smart cards are SIM ...