Hi, i have an iphone 3gs and had it for over 2 years. It currently has the IOS i believe is 4.2.1 if im looking in the right location. A pal jail broke the phone when i got it so it hasnt changed pretty much since then. Im just wondering if there will be a negative effect if i update to the latest version of the IOS in the normal way? I remember some years back a pal who had the iphone3 updated to a version of IOS that completely drained the battery etc. I may be wrong. Any advice would be greatly appreciated.