Iphone OS 4 was unveiled last April 8, 2010. Apple said it is the biggest and most exciting software update yet. iPhone OS 4 will include over 100 new user features for iPhone and iPod touch owners to enjoy. And for developers, a new software development kit (SDK) offers over 1500 new APIs to create apps that are even more powerful, innovative, and amazing.iPhone OS 4 will ship this summer for iPhone and iPod touch, and for iPad in the fall. A developer beta is available now.
100+ New User Features
With iPhone OS 4, iPhone owners will enjoy over 100 new features that make it easier to interact with apps, manage email, read books, and more. New features include the following:
Multitasking
Developers will have access to seven multitasking services, which will allow tasks to be performed in the background while preserving performance and battery life. So you’ll be able to make a Voice over IP call while playing a game or checking email, find a restaurant on Urbanspoon while listening to Pandora, and more.Folders
Organize apps into folders with drag-and-drop simplicity. Get faster access to your favorites and browse and manage up to 2160 apps at once — many more than the current limit of 180 apps.Even Better Mail
See messages from all your email accounts displayed together in a unified inbox, switch between inboxes more quickly, organize messages by threads, and even open attachments in third-party apps.iBooks
The best way to browse, buy, and read books on a mobile device. Easily flip through the pages of a book you've downloaded from the iBookstore while listening to your music collection. Browse tens of thousands of books — many of them free — by title, author, or genre. You can even check out reviews and read sample pages before you buy.
