Apple's iPhone 6s is the company's new sales champ, with 13 million units sold just three days after launch. "Sales... (blew) past any previous first weekend sales results in Apple's history," said CEO Tim Cook in a statement. The new handset easily beat the iPhone 6, which was in 10 million consumer's hands by the same three-day period a year ago. So how did Apple manage to sell around $10 billion worth of phones in such a short time-frame? Good press on the devices didn't hurt, but for the first time, the iPhone 6s launched in China at the same time that it debuted in the US and Europe.