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  2. Motorola StarTAC - Wikipedia

    en.wikipedia.org/wiki/Motorola_StarTAC

    The StarTAC is a series of mobile phones released by Motorola starting in 1996. It is the successor of the MicroTAC, a semi- clamshell design first launched in 1989. [2] Whereas the MicroTAC's flip folded down from below the keypad, the StarTAC folded up from above the display. The StarTAC was among the first mobile phones to gain widespread ...

  3. 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.

  4. Type Allocation Code - Wikipedia

    en.wikipedia.org/wiki/Type_Allocation_Code

    The Type Allocation Code (TAC) is the initial eight- digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network ...

  5. SIM swap scam - Wikipedia

    en.wikipedia.org/wiki/SIM_swap_scam

    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.

  6. Removable User Identity Module - Wikipedia

    en.wikipedia.org/wiki/Removable_User_Identity_Module

    Removable User Identity Module (R-UIM, usually pronounced as "R-yuim") is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks. To work in CDMA networks, the R-UIM contains an early version of the CSIM application. The card also contains SIM (GSM) application, so it can work on both ...

  7. Mobile signature - Wikipedia

    en.wikipedia.org/wiki/Mobile_signature

    Technically the mobile signature is created by a security module when a request for it reaches the device ( SIM card) and after introducing the request to the user with a few explanation prompts, the device asks for a secret code that only the correct user should know. Usually, this is in form of a PIN.

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