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2. iPhone 4 - Wikipedia

   en.wikipedia.org/wiki/IPhone_4

   This is an accepted version of this page This is the latest accepted revision, reviewed on 1 November 2024. 2010 smartphone by Apple "iPhone 4G" redirects here. For the first iPhone with 4G networking, see iPhone 5. Not to be confused with iPhone 4s. iPhone 4 iPhone 4 (GSM model) in black Developer Apple Inc. Manufacturers Foxconn (UMTS/GSM model) Pegatron (CDMA model) Type Smartphone ...

3. History of the iPhone - Wikipedia

   en.wikipedia.org/wiki/History_of_the_iPhone

   [77] [78] [79] The CDMA version was a bespoke model, lacking a SIM slot and with a revised metal chassis, the design of which would be reused on the iPhone 4S. [80] During Apple's official unveiling of iPhone 4S on October 4, 2011, it was announced that Sprint would begin carrying the reconfigured CDMA iPhone 4 and iPhone 4S in the US on ...

4. iPhone 4s - Wikipedia

   en.wikipedia.org/wiki/IPhone_4S

   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. [23] All changes were internal (slight external differences between the iPhone 4 GSM model and the iPhone 4s exist, as said differences existed between the CDMA and GSM models of the iPhone 4). [25] [26]

5. Code-division multiple access - Wikipedia

   en.wikipedia.org/wiki/Code-division_multiple_access

   Multiplexing. Code-division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth).

6. Comparison of mobile phone standards - Wikipedia

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

   In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA.

7. iPhone - Wikipedia

   en.wikipedia.org/wiki/IPhone

   Apple issued an update for iOS (version 4.3.3, or 4.2.8 for the CDMA iPhone 4) which reduced the size of the cache, encrypted it, stopped it being backed up to iTunes, and erased it entirely whenever location services were turned off. [152]

8. List of Apple codenames - Wikipedia

   en.wikipedia.org/wiki/List_of_Apple_codenames

   AirPods Max – B515[5] AirPort Base Station (1999) – Pogo. AirPort Express 802.11n (5th generation) – K31[6] Apple IIe Card for the Macintosh LC – Double Exposure. Apple II 3.5" Disk Controller Card – NuMustang. Apple Color OneScanner 600/27 – Rio. Apple Color OneScanner 1200/30 – New Orleans. Beats Flex – B372.

9. iPhone hardware - Wikipedia

   en.wikipedia.org/wiki/IPhone_hardware

   All iPhone models have a haptic engine to vibrate when a notification or alert, incoming call, etc. iPhone models before the iPhone 4S use an eccentric rotating mass motor, with the exception of the CDMA model of the iPhone 4. The iPhone 4S and CDMA iPhone 4 [95] use a linear resonant actuator vibrator, which usually uses less power and creates ...