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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. 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.

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. Mobile network codes in ITU region 3xx (North America)

   en.wikipedia.org/wiki/Mobile_network_codes_in...

   GSM 1900: NE Alabama; acquired by AT&T in 2008 310: 320: Cellular One: Smith Bagley, Inc. Operational: GSM 850 / GSM 1900 / UMTS / LTE: Arizona / New Mexico [107] 310: 330: Wireless Partners, LLC: Unknown: LTE: Former AN Subsidiary LLC, [84] AWCC, [146] acquired by AT&T, CDMA shut down February 2015 [133] [111] 310: 340: Limitless Mobile ...

6. iPhone hardware - Wikipedia

   en.wikipedia.org/wiki/IPhone_hardware

   The GSM iPhone 4 features a MicroSIM card that is located in a slot on the right side of the device. [78] The CDMA model of the iPhone 4, just the same as any other CDMA-only cell phone, does not use a SIM card or have a SIM card slot.

7. List of wireless network technologies - Wikipedia

   en.wikipedia.org/wiki/List_of_wireless_network...

   This was later changed to 6 half rate time slots for more compressed calls. It was once prevalent throughout the Americas, particularly in the United States and Canada since the first commercial network was deployed in 1993 on AT&T and Rogers Wireless Networks. IS-95 was the first ever CDMA