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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. Removable User Identity Module - Wikipedia

   en.wikipedia.org/wiki/Removable_User_Identity_Module

   KDDI's au IC-Card Sierra Wireless AirCard 555R PC Card wireless modem for the China Unicom network with R-UIM interface (extension at the front). 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.

4. SIM connector - Wikipedia

   en.wikipedia.org/wiki/SIM_connector

   In a mobile telephone communication system, a mobile phone number generally corresponds to a SIM card. As soon as a mobile phone user combines the SIM card with the mobile phone, the system is immediately able to identify the user, providing the kind of transmission services and data gathering services required for billing purposes.

5. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   Some phone models utilize a "hybrid" SIM tray, which can hold either two SIM cards, or one SIM card and one MicroSD memory card. [31] [32] The Huawei Mate 20 range introduced a proprietary memory card format called Nano Memory, exactly the size and shape of a nano SIM card. [33] Some devices accept dual SIMs of different form factors.

6. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning ; end-users can change mobile network operators without the need to physically swap a SIM from the device.

7. The best flip phones for seniors in 2025 - AOL

   www.aol.com/lifestyle/best-flip-phones-184204157...

   Easyfone Prime-A1 Pro 4G Easy-to-Use Flip Cell Phone, 2.4'' HD Display, Big Buttons, Clear Sound, Large Fonts, SOS Button, SIM Card Included, Dumbphone with 1500mAh Battery and a Charging Dock (Black)