Those with authorized Apple developer accounts can update their devices directly through the Software Update section of the built-in Settings application. Monday's launch confirms an earlier rumor that Apple planned to follow a two-week release schedule.
The third beta is said to address a number of issues that previously existed when using Apple's iCloud services. Specifically, people familiar with the accompanying release notes said a number of problems associated with the new iCloud Keychain feature have been fixed in beta 3. Issues that also existed with Find My iPhone and Bookmarks toggles have reportedly been addressed.
Apple also indicated to developers that it has fixed an issue in the Messages application that would present an empty message list on a clean install of iOS 7. Another issue that would cause Messages to crash when viewing attachments on two separate threads has also been addressed.
Fixes in iOS 7 beta 3 are wide ranging, covering issues with push notifications, iCloud Keychain, Messages, and Newsstand.
Developers testing iOS 7 beta 3 will also no longer be prompted with authorization alerts when Newsstand background downloads using HTTP basic or digest authentication are initiated.
The latest beta also squashes a bug that would not save per-app settings in the Background App Refresh option in Settings. In addition, an issue that would not respect custom Passcode Lock and Auto-Lock settings has been fixed.
Apple has also reportedly addressed a common issue where some apps may receive either duplicate push notifications, or no push notification at all. The app switcher has also been updated to show all suspended apps, Apple told developers.
Finally, a bug that would not allow Reminders to work with VoiceOver functionality is said to have been addressed.
As before, has warned users that the second beta "should only be deployed on devices dedicated for iOS 7 beta software development." The prerelease software is not intended for use among the general public.
As such, a number of known issues are said to remain in iOS 7 beta 3 in a range of applications, including Calendar, Contacts, Notes, Safari, Passbook and more.
The second iOS 7 beta was provided to developers two Mondays ago, on June 24. It added new voice options for Apple's Siri personal assistant software.
Apple gave developers the first beta of iOS 7 a month ago at its annual Worldwide Developers Conference. That was also the first time the world, outside of Apple's team, got to see a major design overhaul for the platform.