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2. Assurance Wireless - Wikipedia

   en.wikipedia.org/wiki/Assurance_Wireless

   Website. assurancewireless .com. Assurance Wireless is a telephone service subsidized by the federal Lifeline Assistance program, a government benefit program supported by the federal Universal Service Fund. The service provides to low-income eligible people a free phone, [1] [2] free monthly data, unlimited texting, and free monthly minutes.

3. 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.

4. Zong (mobile network) - Wikipedia

   en.wikipedia.org/wiki/Zong_(mobile_network)

   Zong. CMPak Limited [1] [2] ( Urdu: زونگ ), doing business under brand name Zong, is a Pakistan based mobile data network operator, owned by China Mobile . It is the first overseas setup of China Mobile through acquisition of a license from Millicom to operate a GSM network in Pakistan in 2008. [3]

5. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/Personal_unblocking_key

   Personal unblocking key. A personal unblocking key ( PUK ), sometimes called personal unblocking code ( PUC ), is used in SIM cards to reset a personal identification number (PIN) that has been lost or forgotten. Most mobile phones offer the feature of PIN protection. After switching on the phone, if the PIN security function is active, the ...

6. 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.

7. Portal:Telephones - Wikipedia

   en.wikipedia.org/wiki/Portal:Telephones

   The Telephones Portal. A rotary dial telephone, c. 1940s. A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables ...