Apple has just released mobile OS for iPhones. iOS 4.2 Beta Software is the latest update for its iPhone 4, iPod touch 4G, iPhone 3G, iPhone 3GS and its available for download. If you have a membership of the iPhone Developer Standards or the Enterprise Program then you can also download the iOS 4.2 beta firmware for iPhone 3GS, 3G and iPod Touch 2G and 3G now from the home site of Apple.

Let us discuss the new features of iOS 4.2 Software Update: Features like wireless printing, Airtunes and AirPlay are the new add-ons in this version of OS for iPhone. In Wireless printing, the Print Center appears along with the number of print jobs in multitasking tray. With AirPlay [previously called AirTunes] you can also listen music from all over your house from your iPhone mobile device. Apart from this feature, you can also stream all kinds of media anywhere in your house. Isn’t this an Amazing feature of iPhone!

According to the Apple’s press release, AirPrint can automatically locate printers on the local networks and can print text, graphics and photos to them wirelessly over Wi-Fi network without the need of drivers or software. The printer manufacturers are needed to build the AirPrint support into their printers to avail this service. The HP’s ePrint enabled printers have such functionalities. The models of HP printers that include this functionality are HP Photosmart, LaserJet Pro and Officejet Pro series.

The iOS 4.2 software update works with iPhone 4, iPhone 3G, and iPhone 3GS and it is important to keep in mind that all of the features are not compatible with all iDevices. For example, multitasking is available only with iPhone 4, iPhone 3GS and iPad.

Following are the updates in concern with iPhone iOS 4.2:

Update 1: Developers who plan to test the iOS 4.2 beta version must also be running the latest beta version of Mac OS X 10.6.5, Snow Leopard to ensure its compatibility with the AirPrint wireless printing.

Update 2: The iOS 4.2 OS for iPhone provides you the ability to import .ics calendar files directly for your events.

Update 3: Apple has changed the functionality of external rotation toggle. If you want to lock rotation then you have to use the multitasking bar

Update 4: This iOS 4.2 update allows Fast App Switching called “multitasking”.

Update 5: The iOS 4.2 AirPrint wireless printing for iPhone 3G owners does not work properly. According to Apple Company, Printing feature is available only on iOS devices that support multitasking.

Update 6: In addition to the personalized ring tones, the iOS 4.2 now offers the possibility of setting different SMS tones to the different contacts.

Update 7 : The iOS 4.2 version features Video Walkthrough.

All these features of iOS 4.2 version, truly makes it the best iOS till the date.