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  2. iPhone hardware - Wikipedia

    en.wikipedia.org/wiki/IPhone_hardware

    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. An iPhone 4S activated on a CDMA carrier, however, does have a SIM card slot but does not rely on a SIM card for activation on that CDMA network. A CDMA-activated iPhone 4S usually has a carrier-approved roaming SIM ...

  3. iPhone 4s - Wikipedia

    en.wikipedia.org/wiki/IPhone_4S

    The iPhone 4s setup screen – it is the first iPhone that does not need to connect to iTunes in order to be activated because iOS 5 introduces features such as iCloud. The iPhone 4s, like other iPhones, runs iOS, Apple's mobile operating system. [34] The user interface of iOS is based on the concept of direct manipulation, using multi-touch ...

  4. 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 ...

  5. iOS 6 - Wikipedia

    en.wikipedia.org/wiki/IOS_6

    iPhone 4S only, improves cellular reliability for iPhone 4S. [55] [56] Bug Fixes 6.1.2 10B146 10B147 [f] February 19, 2013 Fixes a bug in Exchange calendar that increased network activity and reduced battery life. [57] [58] Bug Fixes 6.1.3 10B329 BrightonMaps March 13, 2013 Fixes a bug that allowed a passcode lock screen bypass to access the ...

  6. iOS 5 - Wikipedia

    en.wikipedia.org/wiki/IOS_5

    iOS 5 was the subject of criticism for iPhone 4s users, as the initial release had poor battery life, failures of SIM cards, and echoes during phone calls. These problems were fixed in subsequent releases. iOS 5 is the last version of iOS that supports the third-generation iPod Touch and first-generation iPad.

  7. Number of agencies have concerns about 'sideloading' on ... - AOL

    www.aol.com/news/number-agencies-concerns-side...

    By Foo Yun Chee. BRUSSELS (Reuters) -A number of government agencies in the European Union and elsewhere have voiced concerns about security risks as Apple opens up its iPhones and iPads to rival ...

  8. eSIM - Wikipedia

    en.wikipedia.org/wiki/ESIM

    An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning ; end-users can change mobile network operators without the need to physically swap a SIM from the device.

  9. SIM lock - Wikipedia

    en.wikipedia.org/wiki/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.

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