u said 1g phone, i assume a 2g? with 2g, is easy and u can get it unlock very easy.
i did post a step by step instruction here, but i couldn't find it.
things u need to get starting
itune 8
quickpwn 2.2
bl-39
bl-46
u can get all those here, plus instruction
iClarified - iPhone - How to Unlock/Jailbreak Your 2.x.x 2G iPhone Using QuickPwn (Windows)
firmware 2 is different then 1, u have app store and screen short, some new feature, with 2.2, u have google street view. its going to be a new toy to you again, lol. enjoy