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2. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).

3. Apple SIM - Wikipedia

   en.wikipedia.org/wiki/Apple_SIM

   The Apple SIM is known as a Removable SIM with Remote Provisioning [4] – it is a special SIM card that may be configured with different operator profiles. This is in contrast to an embedded SIM, which is not removable and may also be remotely provisioned. It appears that Apple has begun to include both types of SIM in their newer devices.

4. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   An eSIM ( embedded SIM) is a form of SIM card that is embedded directly into a device. Instead of an integrated circuit located on a removable SIM card, typically made of PVC, an eSIM consists of software installed onto an eUICC chip permanently attached to a device. If the eSIM is eUICC-compatible, it can be re-programmed with new SIM information.

5. iPhone hardware - Wikipedia

   en.wikipedia.org/wiki/IPhone_hardware

   An iPhone 4S activated on a CDMA carrier, however, does have a SIM card slot but does not rely on a SIM card for activation on that CDMA network. A CDMA-activated iPhone 4S usually has a carrier-approved roaming SIM preloaded in its SIM slot at the time of purchase that is used for roaming on certain carrier-approved international GSM networks ...

6. iPhone SE (1st generation) - Wikipedia

   en.wikipedia.org/wiki/IPhone_SE_(1st_generation)

   iPhone. The first-generation iPhone SE (also known as iPhone SE 1 or iPhone SE 2016; SE is an initialism of Special Edition [8]) is a smartphone that was designed, developed, and marketed by Apple Inc. It is part of the 9th generation of the iPhone alongside the higher-end iPhone 6s and 6s Plus.

7. iPhone 4 - Wikipedia

   en.wikipedia.org/wiki/IPhone_4

   The iPhone 4 is a smartphone that was designed, developed, and marketed by Apple Inc. It is the fourth generation of the iPhone lineup, succeeding the iPhone 3GS and preceding the 4S. Following a number of notable leaks, the iPhone 4 was first unveiled on June 7, 2010, at Apple's Worldwide Developers Conference in San Francisco, [9] and was ...

8. iPhone SE (3rd generation) - Wikipedia

   en.wikipedia.org/wiki/IPhone_SE_(3rd_generation)

   The third-generation iPhone SE (also known as the iPhone SE 3 or the iPhone SE 2022) is a smartphone designed and developed by Apple Inc. It is part of the 15th generation of the iPhone, alongside the iPhone 13 and 13 Mini and iPhone 13 Pro and 13 Pro Max models. Apple announced the third-generation iPhone SE on March 8, 2022, as the successor ...

9. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   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 containing a user's subscription information and phone book. This allows users to retain their information after switching handsets. Alternatively, users can change networks or network identities without switching ...