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  2. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

    A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) 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).

  3. Dual SIM - Wikipedia

    en.wikipedia.org/wiki/Dual_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 for keeping both connections in a "standby" state for automatic switching, or have two transceivers to maintain ...

  4. Motorola StarTAC - Wikipedia

    en.wikipedia.org/wiki/Motorola_StarTAC

    The phone will request an unlock code if a non-Orange SIM card is inserted. In its original state, these phones can only work if one still has an active Orange SIM card. However, if unlocked both these models will function on the EE network (either directly or via an MVNO on EE's network).

  5. Mobile phone feature - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_feature

    A hybrid mobile phone can take more than one SIM card, even of different types. The SIM and RUIM cards can be mixed together, and some phones also support three or four SIMs. [15] [16] From 2010 onwards they became popular in India and Indonesia and other emerging markets, [17] attributed to the desire to obtain the lowest on-net calling rate.

  6. GSM - Wikipedia

    en.wikipedia.org/wiki/GSM

    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 [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.

  7. Universal integrated circuit card - Wikipedia

    en.wikipedia.org/wiki/Universal_integrated...

    This will also transfer their phone book and text messages. Similarly, usually a subscriber can change carriers by inserting a new carrier's UICC card into their existing handset. However, it is not always possible because some carriers (e.g., in U.S.) SIM-lock the phones that they sell, preventing rival carriers' cards from being used.

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