Need to Jailbreak IOS 4.1? Limera1n and greenpois0n both work for the 3GS. I am not sure the difference, but they are both working on the 3GS and iPhone 4. Some people, like myself have run into problems when trying to JB. If you have JB with Limera1n and do not see the icon, try this: Run program (Limera1n from pc) as administrator, Just right click it. Open iTunes Restart iPhone, both regular reset, and holding down power and sleep Try JB with Greenpoison Search Limera1n in spotlight I tried all of these and nothing worked, if Limera1n will not show up on your device, try JB with Greenpois0n, after doing that... My iPhone showed Loader (the greenposi0n launcher) and Limera1n. Best of luck, if anyone has any question, post here and we could help.