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2. 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 ...

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 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 ...

5. iPhone - Wikipedia

   en.wikipedia.org/wiki/IPhone

   In January 2011, as Apple's exclusivity agreement with AT&T was expiring, Verizon announced that they would be carrying the iPhone 4, with a model compatible with Verizon's CDMA network releasing on February 10. [26] [27]

6. Publisher of 'Consumer Reports' Calls for Verizon to Clarify ...

   www.aol.com/news/2011-02-08-publisher-of...

   As Verizon Wireless prepares its long-awaited launch of the iPhone 4 this week, Consumers Union, publisher of the influential Consumer Reports, called on the carrier Tuesday to clarify its upgrade ...

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.