Apple announced iPhone 4 on 24th June 2010 with the new upgraded OS iOS 4 with several features. The other old 3G and 3GS phones can also be upgraded to iOS 4.
Unlocking Necessary for iPhone?
If you are using the iPhone on a contract then it does not need an unlock. But, for those who needs to use it on other networks and other countries after buying a iPhone in US, UK etc it necessary to unlock. Unlocking it will work on any SIM card worldwide.
Now unlock iPhone 3G, 3GS and 4 to run iOS 4 and get all the features enabled .
