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  2. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    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. This is in contrast to a phone (retrospectively called SIM-free or ...

  3. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

    SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).

  4. Free Mobile - Wikipedia

    en.wikipedia.org/wiki/Free_Mobile

    mobile .free .fr. Free Mobile S.A.S. is a French telecommunications company, subsidiary of Free S.A.S. that provides wireless Internet to consumers in France. It was the fourth mobile network operator to obtain a metropolitan French 3G license in 2009. It also obtained a 4G license in 2011.

  5. Prepaid mobile phone - Wikipedia

    en.wikipedia.org/wiki/Prepaid_mobile_phone

    Prepaid mobile phone. 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 ...

  6. Wikipedia

    en.wikipedia.org/wiki/Free-mobile-sim-card

    Wikipedia

  7. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. [1] [2] In 2016, MVNOs across the nation such as Metro PCS, Boost Mobile, Cricket Wireless, and Tracfone brands served about 36 million subscribers.

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