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2. 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 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.

3. VodafoneZiggo - Wikipedia

   en.wikipedia.org/wiki/VodafoneZiggo

   In 2003, Vodafone acquired Vodafone Libertel. In 2004, mITE Systems was founded. [16] In 2011, Vodafone Libertel bought BelCompany. In 2012, Vodafone Libertel acquired Telespectrum Telecommunicatie. In 2015, Vodafone Libertel acquired mITE Systems. In December 2016, Vodafone Libertel became a subsidiary of VodafoneZiggo.

4. Vodafone Idea - Wikipedia

   en.wikipedia.org/wiki/Vodafone_Idea

   Vodafone Idea, in acronym Vi, is an Indian telecommunications company, headquartered in Mumbai and Gandhinagar. [ 7 ] [ 8 ] [ 9 ] It is an all-India integrated GSM operator offering mobile telephony services.

5. SIM Application Toolkit - Wikipedia

   en.wikipedia.org/wiki/SIM_Application_Toolkit

   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 ...

6. 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.

7. Roaming SIM - Wikipedia

   en.wikipedia.org/wiki/Roaming_SIM

   The use of roaming SIM cards in its most common form is in normal voice applications such as mobile phone calls. The common application of roaming SIMs for voice is where mobile calls are automatically routed to, and made on, the least cost network. This typically means that incoming calls are free, no matter which network a mobile user is on.

8. List of mobile virtual network operators in the United Kingdom

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

   Vodafone: 15 December 2016 [44] Ceased operations. LIFE Mobile: EE: 29 November 2016 [45] Acquired by Plusnet. Mobile by Sainsbury's: Vodafone: 15 January 2016 [46] Ceased operations. Our Telecom EE: 16 August 2016 [47] Dissolved. Ovivo Mobile: Vodafone: 19 March 2014 [48] Ceased operations. PG Mobile Three: 2016 [49] Ceased operations. Plusnet ...

9. SIM swap scam - Wikipedia

   en.wikipedia.org/wiki/SIM_swap_scam

   A SIM swap scam (also known as port-out scam, SIM splitting, [1] simjacking, and SIM swapping) [2] is a type of account takeover fraud that generally targets a weakness in two-factor authentication and two-step verification in which the second factor or step is a text message (SMS) or call placed to a mobile telephone.