Hi I want to jailbreak but not unlock my iPhone 3g was jailbroken now upgraded to 4.1 but not unlocked it needs to stay with o2. I would like multitasking too. Now I've searched for guides all over google and I come by alot of guides but which ones best to use? Most of them get to the end before they say mac only! Or it's an old guide. I have windows vista, and I can update whateves needed but if someones got a working guide or a little advice please let me know. Have you got a good guide?