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2. File:GSM SIM card evolution.svg - Wikipedia

   en.wikipedia.org/wiki/File:GSM_SIM_card...

   English: evolution path of GSM SIM card showing full-size SIM card (1FF), Mini SIM card (2FF), Micro SIM card (3FF) and Nano SIM card (4FF) Date: 25 July 2012: Source:

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. 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]

5. 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]

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. Motorola StarTAC - Wikipedia

   en.wikipedia.org/wiki/Motorola_StarTAC

   Along with the M6088, it was the only StarTAC to use a mini-SIM card (2FF). All other GSM models used a full-sized SIM card (1FF), the size of a standard debit/credit card meeting ISO/IEC 7810 specifications. On the used market there are many 130 models that are sold as dual-band, operating on GSM 900 and 1800. These can be identified by the ...