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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. iPhone 4s - Wikipedia

   en.wikipedia.org/wiki/IPhone_4S

   The iPhone 4s has a stainless steel, dual cellular antenna design, identical to iPhone 4 CDMA. Apple redesigned the antenna in the iPhone 4 CDMA after some original iPhone 4 users reported cellular signal attenuation problems as a result of holding it in certain positions.

4. 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).

5. iPhone 4 antenna woes contextualized by dude in the know - AOL

   www.aol.com/news/2010-06-25-iphone-4-antenna...

   It's the ultimate of ironies that Apple's externalized antenna array in the iPhone 4 -- hoped (and hyped up) to finally give us a phone every bit as good the rest of the device -- has become the ...

6. Apple Antenna Expert Predicted iPhone 4's Dropped Call ... - AOL

   www.aol.com/news/2010-07-15-apple-antenna-expert...

   Apple (AAPL) CEO Steve Jobs received a heads-up warning about potential iPhone 4 reception problems early in the planning process from the company's senior antenna expert, according to a Bloomberg ...

7. 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 ...