Apple recently released the 4.2.1 version of iOS for Apple devices [primarily targeted at Apple iPad]. You can directly download iOS 4.2 on your device here. Below is a detailed overview of iOS 4.2 Features.
iOS 4.2.1 Features:
MobileMe is now free for all iDevices. Using Find My iPhone app, you can now trace your lost iPhone or iPod touch using GPS and WiFi based information. All you need is to enter your free Apple ID and create a MobileMe account in the device you want to trace.
Airplay allows wireless streaming of your music and video to Airport Express connected devices. This is just limited to apple products only and you cannot stream media to other devices.
Wireless printing is being introduced in the new iOS 4.2. You can directly print your document to compatible HP Wireless printers. Only a month ago HP introduced wireless printers in the market.
The multi tasking dock has been tweaked a little on the new version of iOS. Now double clicking the home button brings the fast switcher app.
iOS 4.2.1 is compatible to be updated on all iDevice. Although certain features like MobileMe is restricted to only 3G and 4G devices only.
Good news for iPhone 4 jailbreakers, you can jailbreak iPhone 4 on iOS 4.2 using RedSnow [tethered]. iPhone Dev Team is working on developing GreenPosion for an un-tethered jailbreak. You must already know that GeoHot released LimeRa1n which can jailbreak all versions of iPhone 4, breaking into all future releases of iOS, so no matter how hard Apple tries, the developers can jailbreak the phone. GeoHot has also announced that he has kept the Shatter Exploit for future versions of iPhone 5 which is scheduled to be released somewhere in April or June 2011.
What is tethered Jailbreak ?
For starters who don’t know what is tethering, in this jailbreak you have to plugin the device to your computer every time you restart your device. However the jailbreak for iPhone 3GS and 3G come untethered.
This is a guest post by Sourish Nath who write tutorials to Jailbreak & Unlock iPhone 4 and updates about upcoming iPhone 5 in the year 2011.