the appeal to jailbreaking your 1st gen iPhone, was to use it on other carriers other than AT&T. That jailbreak was also a SIM card jailbreak.
The current jailbreak for the 3G and 2.*.* firmware does not free your iPhone from being locked into your current SIM card.
Right now, the only reason you would jailbreak your iPhone is to use 3rd party apps, not supported or endorsed by Apple, until there is a SIM card unlock.
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