Well i bought a iPhone but unfortunately it had 3.1(7C144) loaded on it! with the baseband at 05.11.07
From what i've read upon, i've seen people jailbreak their's through something called BlackRa1n however you could unlock it if your bootloaders a certain type..
What i don't get is, The custom firmware they have on the websites, are they specific to a country? or doesn't it matter? As they seem to drift more on the US side than the UK side....
Any Help would be appreciated thanks.