Apple's new iOS 5 was only announced at the beginning of the week but already hackers have jailbroken it using a beta version installed on an iPod Touch.
Jailbreaking is the term used to describe the process of removing all access limitations on the device, imposed by the manufacturer - in this case, Apple.
The jailbreak was accomplished with the help of an exploit called limera1n and, according to physorg.com, any device jailbroken in this way must then be tethered to a computer every time it needs to be turned on.
However, as Endgadget reported:
"It's worth mentioning that limera1n is a bootrom exploit that Apple can't patch on the iPod touch through firmware alone. The real test of the Dev Team's wits will be an untethered jailbreak for the iPad 2."