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  2. Comparison of memory cards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_memory_cards

    XM (requires an eXternal electro-mechanical adapter) – Technically the same as EM, but such adapter usually consists of 2 parts: a pseudo-card with pin routing and physical enclosure size that perfectly match the target slot and a break-out box (a card reader) that holds a real card. Such adapter is the least comfortable to use.

  3. 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).

  4. Dual SIM - Wikipedia

    en.wikipedia.org/wiki/Dual_SIM

    A dual SIM tray as shown on a Redmi 13. This phone accepts either two nano SIMs or a nano SIM and a MicroSD card in place of the second SIM slot. Some telephones have a primary and a secondary SIM slot that support different generations of connectivity. For example, 4G and 3G primary, and 3G and 2G secondary, [29] or 5G and 5G, or 5G and 4G. [30]

  5. Nano Memory - Wikipedia

    en.wikipedia.org/wiki/Nano_Memory

    NM card. 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]

  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. Memory card - Wikipedia

    en.wikipedia.org/wiki/Memory_card

    Nano Memory (NM) card; MU-Flash (Mu-Card) (Mu-Card Alliance of OMIA) C-Flash; SIM card (Subscriber Identity Module) Smart card (ISO/IEC 7810, ISO/IEC 7816 card standards, etc.) UFC (USB FlashCard) (uses USB) FISH Universal Transportable Memory Card Standard (uses USB) Intelligent Stick (iStick, a USB-based flash memory card with MMS)