I've got an extra iPhone right here with bookmarks, apps and photos on it. I'm going to Reset all Settings and tell you what happens. Go to Settings>General>Reset>Reset all Settings I have selected "Reset all Settings" and Here are my findings. Enjoy! 1. It reset my home screen icon positions 2. It reset my network settings 3. Did not remove my Safari bookmarks 4. Mail settings stayed 5. iPod settings are back to default 6. Store sign-in settings reset. I am signed out. 7. Backlight is back to 50% 8. All General settings are back to default 9. Wallpaper is still intact 10. Sounds have been set to default. 11. Notes are still intact 12. Photos are still intact 13. SMS message conversations unchanged 14. Phone favorites unchanged 15. Third party app settings remain untouched (I'm still logged into Twitterrific and all my settings are the same) *** Warning: Do not hit Erase all Content and Settings *** Guess what that does Any questions, post them here and I'll test it for you.