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2. 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.

3. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) 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 devices (such as mobile phones and laptops).

4. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   Also, most providers will unlock the phone on demand. Usually a fee is charged during the first two years after purchase; afterwards the unlocking is free. As of 2022, new phones are rarely distributed with a SIM lock; [37] old phones however may still be locked.

5. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone

   The SIM securely stores the service-subscriber key (IMSI) and the K i used to identify and authenticate the user of the mobile phone. The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device, provided that this is not prevented by a ...

6. Phone cloning - Wikipedia

   en.wikipedia.org/wiki/Phone_cloning

   A selection of mobile phones that can be cloned. Code-Division Multiple Access (CDMA) mobile telephone cloning involves gaining access to the device's embedded file system /nvm/num directory via specialized software or placing a modified EEPROM into the target mobile telephone, allowing the Electronic Serial Number (ESN) and/or Mobile Equipment Identifier (MEID) of the mobile phone to be changed.

7. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   The first Prepaid card was called "Mimo" and was launched by TMN, the mobile phone operator of Portugal Telecom, in September 1995. [6] In 2006 Swisscom celebrated ten years with its product and service "NATEL® easy" which also holds a patent on "Prepaid mobile subscriber identification card and method implemented thereby".