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2. iPhone 4 - Wikipedia

   en.wikipedia.org/wiki/IPhone_4

   An iPhone 4 A1332 with a micro-SIM card removed with a paper clip, showing its SIM card compartment. The GSM iPhone 4 uses a micro-SIM card, which is positioned in an ejectable tray, located on the right side of the device. The CDMA iPhone 4, however, the phone connects to the network using an ESN. All prior models have used regular mini-SIM ...

3. iPhone 4s - Wikipedia

   en.wikipedia.org/wiki/IPhone_4S

   The iPhone 4s[a] is a smartphone that was designed, developed, and marketed by Apple Inc. It is the fifth generation of the iPhone, [12] succeeding the iPhone 4 and preceding the iPhone 5. It was announced on October 4, 2011, at Apple's Cupertino campus, and was the final Apple product announced in the lifetime of former Apple CEO and co ...

4. GSM frequency bands - Wikipedia

   en.wikipedia.org/wiki/GSM_frequency_bands

   In North America, GSM operates on the primary mobile communication bands 850 MHz and 1900 MHz. In Canada, GSM-1900 is the primary band used in urban areas with 850 as a backup, and GSM-850 being the primary rural band. In the United States, regulatory requirements determine which area can use which band. The term Cellular is sometimes used to ...

5. List of Apple products - Wikipedia

   en.wikipedia.org/wiki/List_of_Apple_products

   iPhone: September 12, 2012 iPhone 4 (GSM) (16 & 32 GB) iPhone: October 4, 2011 July 27, 2010 iMac (Mid 2010) iMac: May 3, 2011 Magic Trackpad: Pointing devices: October 13, 2015 Apple Battery Charger: Input Device Accessories January 15, 2016 LED Cinema Display (27") Displays: December 2, 2013 August 9, 2010 Mac Pro (Mid 2010) Mac Pro: June 11 ...

6. 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.

7. 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.