Last night I synced my iPhone 3G so I could swap out music in preparation for a trip. Now none of my apps work except the ones that came preinstalled. Anything I try starts to launch, shows its start screen, then immediately quits. IPod, maps, email, calendar, etc. all work fine. I thought I might try reinstalling, but when I opened the app store app it said the app store was not available. Now I'm away from home with no computer. What can I do?