
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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If the iPhone is available for sale at the Apple Store as an "unlocked" phone that you just add you GSM sim card to, then any GSM service will work. I knwo Verizon doesn't used sim cards so even if this is the case, you'd be SOL on some of the carriers.
It really depends what Apple is getting at with the whole "exclusive carrier" thing. Personally although i'm a cingular customer i really begrudge buying a product from them, i'd much prefer to buy elsewhere then just put my sim card into the device.