It seems that the iPhone 4 is not exactly built to be a world traveler. According to a report, a woman in Norway was refused repair on her iPhone by the Apple Store after she pulled it from her pocket and found it shattered while strolling around in -14C conditions.
Apparently the phone is not designed to work at below freezing temperatures as well as above 35 degrees Celsius. There is a warning from the phone when it's getting too hot, but you get nothing from the iPhone when it's close to freezing to death ..besides a busted surprise when you reah into your pockets to warm up your hands. Maybe this will spawn a whole new line of iPhone sweaters for colder climates.