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Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
• VoLTE, VoWIFI, ViLTE : available for postpaid, request activation for prepaid subscribers • eSIM : available on postpaid and prepaid subscribers 55.2 (December 6, 2023) [ 139 ]
A prepaid mobile device, also known as a pay-as-you-go (PAYG), pay-as-you-talk, pay and go, go-phone, prepay, or burner phone, is a mobile device such as a phone for which credit is purchased in advance of service use. The purchased credit is used to pay for telecommunications services at the point the service is accessed or consumed.
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.
in a QR code scanned by the user; by manually entering the SM's host name/Activation code on screen; hard coded by the host device manufacturer in firmware. via a universal discovery service operated by the GSMA. The LPA is responsible for validating the X.509 certificate of the SM is valid and issued by the GSMA certificate authority. [12]
The user submits a code corresponding to the service available. USSD can be used to provide independent calling services such as a callback service (to reduce phone charges while roaming), enhance mobile marketing capabilities or interactive data services. USSD is commonly used by prepaid GSM cellular phones to query the available balance.
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) 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 devices (such as mobile phones and laptops).
TNT is known for its low-cost packages, catering mostly to the mobile needs of the masses of the Philippines. From classics like Gaan Text 10 to unlimited offers like Unlitext Extra 30, TNT provides a wide range of offerings in call, text, mobile internet, and other value-added services. Talk 'N Text logo used from 2000 to 2010.
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