I got my iPhone 3G about a week ago. On my Usage screen it says: What does this mean? I assume "Lifetime" means how long I've talked on the phone since I got it, but I'm not sure. Is current period linked to my AT&T billing cycle? Is that how long I've talking during the current billing cycle, meaning next billing cycle that resets to 0 while the "Lifetime" keeps going up? Thanks for any information.