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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

   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]

4. 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 ...

5. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   SIM lock. A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM ...

6. Unlocked iPhone FAQ, including AT&T plan info (updated) - AOL

   www.aol.com/news/2011-06-14-unlocked-iphone-faq.html

   Updated with information about AT&T plans. As we posted earlier, Apple is selling an unlocked version of the iPhone in the US starting at US$649. To help clarify questions about this development ...

7. iOS jailbreaking - Wikipedia

   en.wikipedia.org/wiki/IOS_jailbreaking

   iOS jailbreaking. iOS jailbreaking is the use of a privilege escalation exploit to remove software restrictions imposed by Apple on devices running iOS and iOS-based [a] operating systems. It is typically done through a series of kernel patches. A jailbroken device typically permits root access within the operating system and provides the right ...