Apple Releases iPhone OS 4 Beta 2 and SDK to Developers - MacRumorsOpen MenuShow RoundupsShow Forums menuVisit ForumsOpen Sidebar
Skip to Content

Apple Releases iPhone OS 4 Beta 2 and SDK to Developers

145204 iphone sdk 4

Apple today released via the iPhone Dev Center its second beta version of iPhone OS 4 and the associated Software Development Kit (SDK) for developers to use in creating and updating applications. The initial versions of iPhone OS 4 and the SDK were released earlier this month alongside Apple's media event to introduce the features of the next-generation operating system.

iPhone OS 4 will bring a number of new features, including various services supporting multitasking, email enhancements, and greater access for third-party application to built-iPhone functions such as calendars, photos, and camera controls. In all, Apple notes that iPhone OS 4 brings over 1,500 new APIs for developers to use in their applications.

Apple is expected to publicly release iPhone OS 4 to iPhone and iPod touch users "this summer", although early models of those devices will not be compatible with the new OS and even some newer models will not be able to take advantage of all of the features. iPhone OS 4 will come to the iPad "in the fall".

Related Forum: iPhone

Popular Stories

Apple Event Logo

Apple Working on All-New Operating System

Wednesday July 29, 2026 11:39 am PDT by
Apple is developing an all-new operating system that is essentially a mix of tvOS, watchOS, and iOS, according to Bloomberg's Mark Gurman. In a report this week, he said the operating system will feature a grid of icons, widgets, and apps, along with customizable clock faces. The new software platform is intended for Apple's long-rumored smart home hub. With built-in facial recognition,...
imac video apple feature

Apple Made Its Second-Biggest Acquisition Ever This Year

Wednesday July 29, 2026 12:03 pm PDT by
Apple this year acquired Israeli startup Q.ai for close to $2 billion, according to the Financial Times. That would make this Apple's second-biggest acquisition ever, after it paid $3 billion for the popular headphone maker Beats in 2014. This is also the largest known Apple acquisition since the company purchased Intel's smartphone modem business and patents for $1 billion in 2019. Q.ai...
Four iPhone 18 Pro Colors Mock Feature

iPhone 18 Pro and iPhone Ultra: Pre-Orders and Release Date

Thursday July 30, 2026 6:12 am PDT by
Apple has yet to reveal when the iPhone 18 Pro and iPhone Ultra will be announced and released, but the dates usually follow a familiar pattern. Labor Day is September 7 this year. The last time the holiday fell on that day was in 2020, but the iPhone event that year was delayed until October due to the COVID-19 pandemic. So, the last time Labor Day was on September 7 in a normal year was in ...

🔗 Related Apple News & Rumors

Stay updated with the latest Apple ecosystem news and verified rumors