AC

As the iconic smartphone for these times, any new iPhone would make a huge splash. But coming so soon after the passing of Apple's longtime visionary leader Steve Jobs, it's possible that the freshest model, the iPhone 4S, will attract even more attention. Apple has already announced that pre-orders for the 4S topped 1 million on the first day you could reserve a phone, bludgeoning the previous mark of 600,000 held by the prior-generation iPhone 4. So much for naysayers put off when Apple failed to introduce an iPhone 5. For a week now, I've been testing the AT&T version of the iPhone 4S in and near New York City and San Francisco. Sprint joins Verizon Wireless as the other U.S. carriers who on Friday will start delivering the device. And Apple takes the finest smartphone on the market to even loftier heights. Does that mean everyone who owns an iPhone ought to upgrade immediately? It does not. Yes, the 4S has a superior camera compared with the iPhone 4. And it has a clever...