I have an iPhone 3GS week 47(new bootrom), running iOS 4.1 and baseband 06.15.00 unlocked for T-Mobile. I really want to upgrade my phone to iOS5 untethered but I know that for awhile that it was impossible and the only way was to have a tethered jailbreak.

Has there been any fixes for this since? Any informations and links to successful untethered jailbreaks/unlocks will be most helpful!

Thanks guys!