Q: I recently updated my iPhone to iOS 7, and the iTunes Store app no longer works. If I launch it, it just quits. How can I get it to start working again?
I had the same problem. When I launched the iTunes Store, the screen flashed for a second and then quit. I tried accessing the iTunes Store by tapping the Store button in the Music app, but I got an alert reading Unable to Connect to iTunes Store. I tried rebooting my iPhone, and that didnt work either.
The solution was to sign out of the iTunes Store and then sign back in. I did so in Settings > iTunes & App Store. After that, the iTunes Store app worked properly.