The latest installment continues to offer a revamped Music app, introducing both function and UI changes to the music playback app, a move that is being read as an indication of the arrival of a new iTunes streaming music service at the Worldwide Developers Conference early next month, reported TechCrunch.

The betas seem to be aimed at refining and zapping bugs in the service and there is a presumption that in a release update, the streaming services will be positioned within the Music app alongside local libraries and iTunes Radio, as well.

Earlier, Apple in iOS 8.3 added support for Apple's personal assistant, Siri, in many new languages, enabling it to function in several more regions.

Siri can now also place calls that immediately start from the speaker phone rather than requiring users to toggle it on manually. The update is also said to improve stability, overall performance and bug fixes for Wi-Fi, Bluetooth, third-party keyboards and a host of other apps.

Among other new changes, Apple now allow users to report junk messages and users now also have the option of complete filtering of iMessages that does not come from its contacts. There is now also the option of downloading free apps without a password, and it is simpler to sign in to Google accounts that use two-factor authentication.

Specific to the iPhone 6 Plus, users will now find dedicated formatting keys for bold and underline in the landscape keyboard.

Apple has also fixed the bug in Safari searches by adjustments to the keyboard and the fixing of the space bar. Apple is working hard to solidify iOS 8's reliability as the company prepares to shift its focus to the next version, iOS 9, which is likely to be unveiled in June.