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USSD is commonly used by prepaid GSM cellular phones to query the available balance. The vendor's "check balance" application hides the details of the USSD protocol from the user. 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.
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the countryv—AT&T Mobility, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
TracFone Wireless, Inc. (TFWI) is an American wireless service provider.It is a mobile virtual network operator offering prepaid and no-contract services on the Verizon network under multiple brands, including TracFone, Straight Talk Wireless, Total Wireless, Simple Mobile, SafeLink Wireless, Page Plus Cellular, Net10 Wireless, GoSmart Mobile, and Walmart Family Mobile (in partnership with ...
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 ...
Technical details. A key technical aspect of Mobile Number Portability (MNP) involves the routing of calls or mobile messages (SMS, MMS) to a number once it has been ported. Various call routing implementations exist globally, but the International and European best practice employs a central database (CDB) of ported numbers.
GSM services. GSM services are a standard collection of applications and features available over the Global System for Mobile Communications (GSM) to mobile phone subscribers all over the world. The GSM standards are defined by the 3GPP collaboration and implemented in hardware and software by equipment manufacturers and mobile phone operators.
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