Dear Members I am scared to jailbreak my iphone 3GS, i dont need to unlock and att is my carrier and i dont want to use any other simcard. I only want jailbreak. Here are some of my questions. 1) Will the jailbreak make my battery life worse? Some people said that their battery drains very fast. 2) Can DFU mode break the iphone in anyway? 3) Can iphone be break if you dont take the ibec and ibss files properly? 4) Can jailbreak make wifi and signal worse?? 5) Can battery drain problem be related to mobilesubstrate (or what it called) These are some of my confusions i have, cause i dont want to brick my iphone. Pls someone give me some suggestions and someone who have alreeady jailbroken iphone 3gs, pls give some tip.