I just got a 3G, and now i'm kinda nervous about jailbreaking it, because while i haven't had a total failure from jailbreaking older phones, i have been told this is teh last iPhone i will get until I can buy my own.. and now I'm kinda nervous about jailbreaking it again and having something catastrophic happen to it and be stuck without a phone.. does anyone know and major differences in jailbreaking a 3g and just an old first gen phone?