Apple iphones are unlocked or jailbroken so that they can be used with all networks.But it is not easy to jailbreak all versions of iphone.Iphone 3G 3GS BOOTROOM has currently no jailbreaking options available.It is tested with ultrasn0w,redsn0w and pwnage tool.So if you update an unblocked iphone to this version your iphone will be blocked again and there is no use in having it locked again.Now here is a tool which helps you check if an iphone can be jailbroken or unlocked before trying any of the unlocking methods.
The application is f0recast which gives you the chance to find if an iphone can be unlocked even before following the procedures to unlock.It works with both windows and max osx.In windows you need .Net framework 2.0 or higher and itunes 9.0 to be installed.In mac you need only itunes 9.0 to be installed.
F0recast will also let you know the bootloaders version,and even suggests you to downgrade to a particular version to get your device unlocked.
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