Apple's latest smartphone, the iPhone 4S, is arguably the year's hottest handset. Not only did the company sell 4 million units during the device's opening weekend, but the smartphone is still flying off of retailer's shelves a month later.
The handset is so popular, in fact, that carriers are having trouble keeping up with consumer demand — Apple can't make them quick enough. And the phone hasn't even found its way into mainland China yet, but it's getting closer...