According to Apple, there are seven major enhancements, supported by more than 100 new features and options in iPhone OS 4.0. Highlights of key features and changes include:
- iBooks eBook reader app with iBookstore with ability to buy once read anywhere and sync page and bookmarks wirelessly across user’s devices.
- Game Center, a social gaming networking app with ability to invite friends, set up matchmaking for multiplayer gaming, leaderboards and achievements.
- Multitasking support so that background audio, background location, VoIP, push notifications, local notification, task completion and other apps can switch fast. But only on iPhone 3Gs and 3rd generation iPod Touch. Older iDevices such as iPhone 3G and iPod touch 2G can upgrade to iPhone firmware OS version 4.0, but won’t support multi-tasking due to limited hardware capability (unless with hack to enable multitasking).
- Enhance emails for unified Inbox for multiple Exchange accounts, threaded messages and fast switching.
- Folders to group apps into folder on drag and drop UI, intelligent naming, support up to 2160 apps on iPhone.
- New Enterprise features such as Data Protection, Mobile Device Management, Wireless App Distribution, Multiple Exchange accounts, Exchange Server 2010, SSL VPN support.
- iAd – mobile advertising based on HTML5.
Other features and enhancements on iPhone OS 4.0 include new framework called accelerate for hardware accelerated math functions, ability to search SMS and MMS messages, Web search suggestions, Bluetooth keyboards, CalDav invitations, larger fonts for Mail, alerts, cell data only setting, spell check, persistent Wi-Fi connection, gift apps, birthday calendar, taking screenshots, more privacy features, recent Web searches, playlists creation, 5x digital zoom, nested playlists, CardDav, tap to focus video, Places in Photos app, geotagging, iPod Out, Home screen wallpaper, ability to set wallpaper for lock screen, wake on wireless, screen orientation lock, ability to access iPod Controls without exiting running app, button to exit running app in the background, file transfer between PC and portable device, and many more. For developers, there are over 1500 new APIs which allow developers to access the calendar, photo library, quicklook.
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