My iPhone 2G is unbearably slow switching between applications. Recently, the battery dies in the early evening everyday and I even have trouble receiving calls. I unlocked it myself using Pwnage 3.0. I read somewhere that if I restore as a new phone that it will clear old settings and help improve performance. My fear though is that will I then lose my notes, SMS or something else? I've been restoring from iPhone backup since v1.1.4. My contacts and calendars are already backed up on Mobile Me.

Thanks.