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2. iPhone 4s - Wikipedia

   en.wikipedia.org/wiki/IPhone_4S

   The iPhone 4s setup screen – it is the first iPhone that does not need to connect to iTunes in order to be activated because iOS 5 introduces features such as iCloud. The iPhone 4s, like other iPhones, runs iOS, Apple's mobile operating system. [34] The user interface of iOS is based on the concept of direct manipulation, using multi-touch ...

3. 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 ...

4. iPhone 4 - Wikipedia

   en.wikipedia.org/wiki/IPhone_4

   The iPhone 4 is a smartphone that was developed and marketed by Apple Inc. It is the fourth generation of the iPhone lineup, succeeding the iPhone 3GS and preceding the iPhone 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, [7] and was ...

5. iPhone 5s - Wikipedia

   en.wikipedia.org/wiki/IPhone_5s

   This was especially the case when iOS 8 was released and both iPhone 5s and iPhone 5c were moved to the mid and low end of the iPhone range, respectively; the iPhone 5s still had 16 or 32 GB (14.9 or 29.8 GiB) storage available while the iPhone 5c had to make do with 8 GB storage with only 4.9GB available to the user after installing iOS 8 ...

6. List of iPhone models - Wikipedia

   en.wikipedia.org/wiki/List_of_iPhone_models

   List of iPhone models. Left image: The backs of an iPhone 6, an iPhone 7, an iPhone 8, and an iPhone SE (3rd generation). Right image: The backs of an iPhone 15 Pro, iPhone 15 Pro Max, iPhone 15 Plus, and iPhone 15. The iPhone, developed by Apple Inc., is a line of smartphones that combine a mobile phone, digital camera, personal computer, and ...

7. Comparison of mobile phone standards - Wikipedia

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

   GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM. Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.