Apple has just released the new iOS 9 beta version, bringing along several improved features. However, among other things, the new mobile operating system supports Wi-Fi calling.

One of the features that has been improved is the interface of CarPlay, the company's infotainment system. According to Tech Times, the heart button artwork pressed to "like" a song has been made larger, in addition to the modifications made to the "Now Playing" screen.

Apple also made changes on the "Handoff & Suggested Apps" feature. The same site learned that with this tweak, the ability of users to get suggestions on the App Store from the lock screen has been removed.

On the contrary, users will see suggestions for the apps that were already installed.

Other than the glyph changes made on the delete, shift and dedication keys, the company has also added new wallpapers and even brought back some old favorites found on iPhone 5C.

Labels for FaceTime buttons were also removed, so users only now have the icons. Plus, there were minor bugs fixed.

So, those were the improved features. Now, let's move on the newest feature added — the Wi-Fi Calling.

To take some pressure off the data networks, some mobile carriers are considering about letting their subscribers make calls via Wi-Fi. It costs less and increases the reliability for calls, so the subscribers are in favor with it. 

Apple built this option into its mobile operating software, Venture Beat learned. Wi-Fi calling was limited to customers of T-Mobile but the new version of iOS 9 will allow this feature on a number of carriers.

Additionally, the report stated that Sprint and AT&T will most likely offer Wi-Fi calling. However, there are no official statements released yet from both companies.

Finally, the iOS 9's Wi-Fi Assist feature. The concept is just simple — enable this feature and if the Wi-Fi connection is bad, it will automatically drop your connection back to cellular data.

This feature is not yet available to Apple iOS8, Tech Crunch reported.