I have a 3GS currently running 3.0.1. I think I used Blackrain to jailbreak it... but not 100% sure. I know it wasn't Spirit though. I am using the BenM.at profile to enable tethering and it works great. Will it still work if I upgrade to 4.0.1 and JB with sn0wbreeze? If not, is there a tether hack for a JB'd iOS 4.0.1? Thanks!