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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. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   Cellular network standards and generation timeline. This is a comparison of standards of wireless networking technologies for devices such as mobile phones.A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.

4. 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.

5. History of mobile phones - Wikipedia

   en.wikipedia.org/wiki/History_of_mobile_phones

   It had applications, or at least a way to deliver more features by plugging a PCMCIA 1.8 MB memory card into the phone. [47] Coinciding with the introduction of 2G systems was a trend away from the larger "brick" phones toward tiny 100–200 grams (3.5–7.1 oz) hand-held devices.

6. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone

   The first SIM card was made in 1991 by Munich smart card maker Giesecke & Devrient for the Finnish wireless network operator Radiolinja. [citation needed] A hybrid mobile phone can hold up to four SIM cards, with a phone having a different device identifier for each SIM Card. SIM and R-UIM cards may be mixed together to allow both GSM and CDMA ...

7. List of iPhone models - Wikipedia

   en.wikipedia.org/wiki/List_of_iPhone_models

   SIM card form-factor Dual SIM with one Nano-SIM and one eSIM, supports dual eSIM No physical SIM card form-factor in U.S. models Dual SIM with one Nano-SIM and one eSIM: Dual SIM with one Nano-SIM and one eSIM, supports dual eSIM Dual SIM with one Nano-SIM and one eSIM: Dual Nano-SIM in mainland China, Hong Kong and Macau Single Nano-SIM in ...