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  2. 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).

  3. Nano Memory - Wikipedia

    en.wikipedia.org/wiki/Nano_Memory

    Nano Memory (NM) is a proprietary memory card format developed by Huawei in 2018. [1] NM cards are the same size as a nano SIM card, so they can be used in the same slots as nano SIMs. [2] They are smaller than micro SD cards, freeing up space and reducing weight in smartphone designs. [3]

  4. 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 an eUICC chip permanently attached to a device. If the eSIM is eUICC-compatible, it can be re-programmed with new SIM information.

  5. Dual SIM - Wikipedia

    en.wikipedia.org/wiki/Dual_SIM

    Dual SIM. A modern Samsung Galaxy phone with two SIM card slots. It uses nano-SIM instead of the normal sized SIM. Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support ...

  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. International mobile subscriber identity - Wikipedia

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

    Website. www .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 ...

  8. List of telecom companies in India - Wikipedia

    en.wikipedia.org/wiki/List_of_telecom_companies...

    Direct-to-home (DTH) operators. There are 4 pay-for-use DTH service providers and one free-to-air service provider (DD Free Dish) in India.. As of 30 September 2023, there are 64.18 million active paying DTH subscribers, in addition to the subscribers of state-owned DD Free Dish, in the country according to Telecom Regulatory Authority of India (TRAI).

  9. 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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