In just a few days after Apple has released its iPhone 2.2 firmware update, the iPhone Dev Team team has already jailbroken it.
With each update, Apple fights against jailbreakers, as a way to protect their exclusive contract with AT&T. An unlocked phone can work with any GSM carrier.
Whenever Apple updates the firmware, previous jailbreaks are broken in terms of the App Store, because most applications require the latest firmware to even run.
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