iOS 4.2 was released to developers on November 8, 2010. It was never released to the public as a WiFi bug was found during the limited release. Apple then issued two more golden master releases. Finally, Apple released iOS 4.2.1 to the public.
iOS 4.2.1 was released on November 22 with support for all Apple A4 devices, 3rd-, and 2nd-generation devices, with the exclusion of the Apple TV. It brings initial support of iOS 4.x to iPad, plus AirPlay and AirPrint to all compatible devices. It also contains minor changes to the YouTube app and alters the multitasking animation. On iPad, the screen rotation lock button's functionality changes to mute, the same as it was originally planned. As a known major bug, this version seems to hinder the usage of the Camera Connection Kit on the iPad.
Home screen
The home screen (rendered by "SpringBoard") with application icons, and a dock at the bottom of the screen where users can pin their most frequently used apps, is presented whenever the device is turned on or the home button pressed. The screen has a status bar across the top to display data, such as time, battery level, and signal strength. The rest of the screen is devoted to the current application.
Folders
With iOS 4 came the introduction of a simple foldering system. When applications are in "wiggle mode," any two can be dragged on top of each other to create a folder, and from then on, any other 10 "apps" can be added to the folder using the same procedure (maximum folders can handle is 12 on iPhone and iPod touch and 20 on iPad.) A title for the folder is automatically selected by the type of applications inside, but the name can also be edited by the user.
Included applications
The iPhone home screen contains these default "apps". Some of these applications are hidden by default and accessed by the user through the Settings app or another method. (For instance, Nike+iPod is activated through the Settings app, and the AirPrint activates when a user prints a file)
Primary Name↓ Usage↓ Version Included↓
Phone Telephone, FaceTime video calling 1.0+ (FaceTime video calling 4.0+)
Mail E-mail client 1.0+
Safari Web browser 1.0+
iPod Portable media player 1.0+
Secondary Name↓ Usage↓ Version Included↓
Messages Text messaging, MMS 1.0+ (MMS 3.0+)
Calendar Calendar 1.0+
Photos Photo viewer 1.0+ (Video viewer 2.0+)
Camera Camera, Camcorder 1.0+ (Video recording and auto-focus iPhone 3GS (3.0) onwards, HD video iPhone 4 (4.0) onwards, HDR iPod Touch 4 (4.1) and iPhone 4 onwards)
YouTube YouTube video streamer 1.0+
Stocks Yahoo! Finance 1.0+
Maps Google Maps 1.0+ (Assisted GPS 2.0+, Compass 3.0+ (iPhone 3GS onwards))
Weather Yahoo! Weather 1.0+
Voice Memos Voice recorder 3.0+
Notes A simple note-taking program 1.0+
Clock World clock, stopwatch, alarm clock and timer 1.0+
Calculator Calculator (includes scientific version) 1.0+ (Scientific calculator 2.0+)
Settings Settings 1.0+
iTunes To access the iTunes Music Store and iTunes Podcast Directory 1.1+
App Store To buy iOS apps 2.0+
Compass Compass 3.0+ (iPhone 3GS onwards)
Contacts Address/phone book 1.0+ (Separate application for iPhone 2.0 onwards)
Nike + iPod Records the distance and pace of a walk or run; can connect to Nike + iPod sensor 2.2.1+ (iPod Touch, 2nd Generation onwards), 3.0+ (iPhone 3GS onwards)
Game Center Allows the user to play multiplayer games with other users, track in game achievements and view leaderboards. 4.1+ (iPod Touch, 2nd Generation onwards, iPhone 3GS onwards)
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