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2. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/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 user is required to enter a 4-8 ...

3. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone ...

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 countryv—AT&T Mobility, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

5. International mobile subscriber identity - Wikipedia

   en.wikipedia.org/wiki/International_Mobile...

   Website. itu.int /rec /T-REC-E.212. The international mobile subscriber identity (IMSI; / ˈɪmziː /) is a number that uniquely identifies every user of a cellular network. [1] It is stored as a 64-bit field and is sent by the mobile device to the network. It is also used for acquiring other details of the mobile in the home location register ...

6. History of the iPhone - Wikipedia

   en.wikipedia.org/wiki/History_of_the_iPhone

   The Verizon iPhone went on sale on February 10, 2011. [ 77 ] [ 78 ] [ 79 ] The CDMA version was a bespoke model, lacking a SIM slot and with a revised metal chassis, the design of which would be reused on the iPhone 4S.

7. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device. Instead of an integrated circuit located on a removable SIM card, typically made of PVC, an eSIM consists of software installed onto a eUICC chip permanently attached to a device. If the eSIM is eUICC-compatible, it can be re-programmed with new SIM ...