iPhone and iPod touch sofware update were released in June 21st 2010 was. Apple’s iOS 4.0.1 Software was released now.
The iOS 4.0.1 Software Update has an implemented improved formula which can decide how many bars of signal strength will appear on the display of iPhone 4, iPhone 3GS, and iPhone 3G. The actual signal power is in fact the samel appear on the display o a good place among woldwide', but the bars on iPhone will show it more precisely.
The new iOS 4.0 and the original iPhone (or the iPod touch) are not compatible. iPhone 3G and second-gen iPhone touch devices will obtain the update, but key features will be missing.Current generation iPod touch, together with the 2009 iPhone 3GS, will receive all the new features, including multitasking, folders, wallpapers, unified inbox, multiple Exchange accounts and more.
The first appearance of iAds will be Apple's next step. This will happen immediately after the current upgrade is complete and the first iPhone 4s are made available for the customers. The first placeholders for iAids are starting to evolve now with some applications. More certain versions are expected to follow. Apple has organized all the business concerns for the software upgrade in silence. For instance, within the iTunes 9.2 Devices menu the image of the iPhone has changed from a basic 3GS to a 3GS featuring the iOS4 wallpaper.
If you want to get the update you must first connect your device to iTunes and follow some simple steps required.
Three key features will make the race for this upgrade to be worth.
1) Multi-tasking
This requires your apps be multitasking-ready. Fundamentally in future, you will be able to keep on listening to music while navigating from one app inside another.

2) Folders
You will be able to group all your apps inside logical collections so that you nested inside folders due to the introduction of Folder. With iOS4 you will be able to group all your games together, or all your social networking apps. You can store up to 12 apps inside each folder.
3) iBooks
iBooks are available for the iPad since that successful product got to the streets, and it is sure that iBooks will come to the iPhone. And even better, when you close a book on your iPhone and then open it again on another device, such as an iPad, your bookmarks etc. will all be in the same place.

Other features that make this upgrade desirable are the Gift apps, which permits you to send apps to your friends and family, the 5xdigital zoom, which allows you to get closer to your subjects by a zoom in up to 5 times, the Spell checking, which works in Mail, Notes and other apps, and it is a built-in dictionary with automatic suggestion of words and correction of spelling mistakes, and the Wireless keyboard support, based on Bluetooth wireless technology.
Upgrading your iPhone to the new iOS 4.0.1 Software is not necessarily an easy operation. Apple's servers will be overwhelmed as millions of users try the upgrade.