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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.
As of March 2023, the penetration rate in Hong Kong was estimated at 282% over a population estimate of over 7.473 million, with 21.61 million public mobile subscriptions. [30] Hong Kong's telecom regulator is the Office of the Communications Authority (OFCA).
A prepaid mobile device, also known as a pay-as-you-go (PAYG), pay-as-you-talk, pay and go, go-phone, or prepay, 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.
Smart Communications Inc., commonly referred to as Smart, is a wholly owned wireless communications and digital services subsidiary of PLDT Inc., [1] a telecommunications and digital services provider based in the Philippines. [2] As of November 2023, it is currently the largest mobile network with 55.2 million subscribers. [3]
Roaming is a wireless telecommunication term typically used with mobile devices, such as mobile phones. It refers to a mobile phone being used outside the range of its native network and connecting to another available cell network .
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.
Roaming is one of the fundamental mobility management procedures of all cellular networks.Roaming is defined [2] as the ability for a cellular customer to automatically make and receive voice calls, send and receive data, or access other services, including home data services, when travelling outside the geographical coverage area of the home network, by means of using a visited network.
While T-Mobile Germany told the court that they would unlock the iPhone after the contract, they were doing it voluntarily. [citation needed] While SIM locking is legal, a court ruled in 2012 that providers must clearly inform potential customers about the SIM lock. [36] As of 2015, usually only prepaid mobile phones are sold with a SIM lock.
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