Apple Releases iPhone OS 4 Beta 4 and SDK to Developers - MacRumors
Skip to Content

Apple Releases iPhone OS 4 Beta 4 and SDK to Developers

204611 liot
New iPhone OS 4 wallpaper option (Source: forum post by nistromo)

Apple is keeping its developers busy today: Alongside a new build of Mac OS X 10.6.4, Apple has also released the fourth beta version of iPhone OS 4 and the associated software development kit (SDK). The release is not much of a surprise given that Apple has taken to biweekly releases of its iPhone development tools and today marks two weeks since the release of the third beta version.

Available to registered developers via the iPhone Dev Center, the fourth beta is a refinement of the operating system and developer tools initially released in early April alongside a media event to introduce the next-generation software for Apple's iPhone OS devices. No details on changes in the new version have yet been documented beyond new wallpaper options, but those with access to the beta are undoubtedly already digging for information.

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

iOS 27 Next to iPhone

Here's When iOS 27 Rolls Out Around the World

Sunday September 13, 2026 3:00 am PDT by
Apple is about to release iOS 27, which will finally deliver more advanced Siri AI capabilities as well as a variety of other refinements, improvements, and new features to iPhones. It's Apple's biggest software update of the year, and Apple announced at Wednesday's iPhone event that it will be releasing iOS 27 sometime tomorrow – Monday, September 14. iOS 27 won't be the only release on...
deep black iphone 18 pro

Apple Says iPhone 18 Pro Max Sold in U.S. Differs in One Way

Saturday September 12, 2026 3:27 pm PDT by
As noted by Nicolas Lellouche, who writes for the French tech website Numerama, Apple has updated its tech specs pages for the iPhone 18 Pro and iPhone 18 Pro Max to clarify which models are equipped with its new C2 cellular modem and where. Apple now says the iPhone 18 Pro has a C2 modem worldwide, while the iPhone 18 Pro Max uses the chip in every country except for the U.S. According...
iphone duo

IMAX Reacts to iPhone Duo's 1:1.4 Aspect Ratio Displays

Friday September 11, 2026 4:42 am PDT by
Production theater company IMAX has responded in a mixed way to Apple's embrace of a 1:1.4 aspect ratio on the iPhone Duo's inner and outer displays. The boxier ratio happens to be very close to the classic "full-frame" IMAX 1.43:1 aspect ratio, which comes from the geometry of the company's original 15-perforation/70mm film system. In response to an X post from someone wondering if we'll see...