In addition to those, among the most important new features delivered in iOS 4 were:. While iOS 4 technically can be run on the iPhone 3G, many users who installed the upgrade on that device had negative experiences.

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In addition to the unsupported features mentioned earlier, iPhone 3G owners ran into problems with iOS 4 including slow performance and excessive battery drain. The problems were initially so bad that many observers counseled users not to upgrade their iPhone 3G phones and a lawsuit was even filed. Share Pin Email. Sam Costello has been writing about tech since His writing has appeared in publications such as CNN. The Apple devices that can run iOS 4 are:. Support for Traditional and Simplified Chinese handwriting recognition.

Mail, contacts, calendars Grouped settings.

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Mail Push e-mail. Ability to select an outgoing email account within Mail application. Ability to view MS Office attachments. Ability to view iWork attachments, including Pages, Numbers, and Keynote.

Ability to search contacts. Global Address List. Push contacts. Ability to import SIM contacts. Calendar Multiple calendars supported in Calendar with colour-coding desktop colours only preserved if using Mobile Me. New "Calendar" menu in "Settings". Enterprise enhancements Enforced security policies. Device configuration. Remote wipe.

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Videos in playlists and music videos can be shown in portrait or landscape orientation. Sound fade-out when exiting a video. Other App Store to manage third-party applications with home screen icon- Store for apps. Certificates and Identities. Ability to turn Wi-Fi back on while in Airplane mode. Ability to take screen captures.

Ability to save pics from Safari or Mail to Photos. Support for SVG. Addition of Parental controls. Password letters are momentarily visible while typing. Ability to turn Location Services on or off. Applications that use Location Services now prompt user for confirmation 3 times. Tapping status bar to scroll to top shortcut.

Updated calculator with extra features in portrait mode, a scientific calculator in landscape mode and an updated icon. Updated iTunes with a new icon and reordered category icons within iTunes application. Camera now supports Geotagging. Bug fixes Performance and stability of Contacts and Calendar applications dramatically improved. Performance while flipping to landscape mode in Safari improved. Performance in Mail app improved. Release improves application crash rates. Keyboard responsiveness improved.

Bug fixes Improved communication with 3G networks. The "Update All" button in the App Store's update tab has been removed.

Initial release on iPod Touch 2nd generation as 2. Faster firmware installation and data sync. Application updates downloaded from iTunes have new finder naming convention. Bug fixes, performance enhancements Security fix to prevent from bypassing the double home button exploit. Fixed bugs causing hangs and crashes for users with lots of third party applications. Faster installation and updating of 3rd party applications. Updating applications keeps their icons in place on the home screen. Improvements to Mail stability.

Improved email reliability, notably fetching email from POP and Exchange accounts. Faster loading and searching of contacts. Auto-correct now appears above the text instead of below fixing a usability problem people were having where auto-correct would appear above the first row of keys. Significantly better battery life for most users. Calculator bug fixed affecting calculations involving Pi. Option to wipe data after ten failed passcode attempts after 5 attempts, the device will disable itself for 1 minute.

After the 6th attempt, it will disable itself for 5 minutes. In the 10th attempt, it will wipe all data. New application features Genius playlist creation. More information provided within iPod Music lists artist and album are now shown below song title when selecting music in addition to remaining time on podcasts.

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More information is provided for audiobooks, such as displaying time left in active audiobook. Sounds can no longer be turned off en masse. All sounds must be turned off individually to mute sounds. New speaker sound when sending mail. Maps Google Street View. Public transit and walking directions. Display address of dropped pins. Share location via email.