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2. iPhone 4s - Wikipedia

   en.wikipedia.org/wiki/IPhone_4S

   After the iPhone 4s was announced, it was considered by some media to be a disappointment, due to the expected release of an iPhone 5. [25] [26] There were no external differences between the iPhone 4 CDMA model and the iPhone 4s, with the exception of a SIM card slot on the iPhone 4s. [25]

3. 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 ...

4. iPhone 4 - Wikipedia

   en.wikipedia.org/wiki/IPhone_4

   Apple updated the bumper with a wider volume switch hole with the release of the iPhone 4 for CDMA networks. The updated bumper is also compatible with iPhone 4s, the next-generation iPhone that has the same exterior design and measurements as the CDMA model of the iPhone 4, but with a SIM card slot as well.

5. Type Allocation Code - Wikipedia

   en.wikipedia.org/wiki/Type_Allocation_Code

   The Type Allocation Code (TAC) is the initial eight- digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network ...

6. List of iPhone models - Wikipedia

   en.wikipedia.org/wiki/List_of_iPhone_models

   The iPhone, developed by Apple Inc., is a line of smartphones that combine a mobile phone, digital camera, personal computer, and music player into one device. Introduced by then-CEO Steve Jobs on January 9, 2007, the iPhone revolutionized the mobile phone industry with its multi-touch interface and lack of physical keyboard.

7. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone 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 ...