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2. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   Comparison of mobile phone standards. Cellular network standards and generation timeline. This is a comparison of standards of wireless networking technologies for devices such as mobile phones. A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.

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. 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.

5. Uswitch - Wikipedia

   en.wikipedia.org/wiki/Uswitch

   uSwitch.com is a free, online comparison and switching service, that helps consumers compare prices on energy, finance, insurance, and other services. There are no direct costs to consumers for the service, the company instead receives a commission from some suppliers when a customer chooses to switch to them. uSwitch provides several ...

6. List of mobile network operators - Wikipedia

   en.wikipedia.org/wiki/List_of_mobile_network...

   List of mobile network operators of the Americas; List of mobile network operators of the Asia Pacific region; List of mobile network operators of Europe; List of mobile network operators of the Middle East and Africa; See also. Telephones portal; Comparison of mobile phone standards; List of sovereign states by number of broadband Internet ...

7. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   Subscriber Identity Module (SIM) A nano sim used in mobile phones. One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.