My sister got her iPhone 3G in March. The metal volume switch on the side fell off (which seems like it should not happen). Her phone should still be covered under warranty. What would be the best way to get it fixed? She doesn't have a backup phone since her previous phone was locked to T-Mobile. She wants to be without her phone for the shortest time she can, or not at all if that's possible. We have an Apple store a little over an hour away, which would be a bit of a pain to get to, but she could do it if that's the best way to get this taken care of. Or would it be better just to call Apple?