Estimated time drivers save by using real-time GPS traffic updates
Drivers that use GPS systems with real-time traffic info spend 18% less time behind the wheel than those who do not.
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OK, just tried. Good news for un-activated users: as long as you have 1 AT&T phone number associated with an activated iPhone, you can use this number to get credit for other un-activated iPhones. I've got $100 for my activated iPhone, and another 2x$100 for my friends' unactivated ones. I got the credit number, PIN, and barcode. At least they all look valid (numbers on each credit are different).
It's easy. Just input your activated iPhone number and the SN for any other iPhone you want to activate. Wait for the SMS with access code on that activated iPhone, and proceed. There was a moment I thought this wouldn't work because the SMS didn't arrive after 5 minutes. Later it turned out to be some AT&T text message delay. So be patient.
Just my personal experience. Can't guarantee anything, of course.