The launch of the iPhone 6s and iPhone 6s Plus has been the biggest yet, with Apple announcing that they've broken their sales record by selling 13 million new iPhones in the three days after its launch late last week.

Apple CEO Tim Cook said in a statement that sales for the new iPhones "have been phenomenal", with new features such as 3D Touch and Live Photos proving popular with consumers. The company is now preparing to launch the iPhone 6s and 6s Plus in an additional 40 countries on October 9th, where even more sales are expected.

Launching the iPhone 6s and 6s Plus in China alongside the United States and other key markets is part of the reason why this launch weekend has been so successful for Apple. The iPhone 6 and 6 Plus launch was delayed in China last year, although the company still managed to sell 10 million devices in its opening weekend.

While the 6s and 6s Plus don't introduce a ton of new features or a radically new design, there are enough changes that make it worth upgrading from previous iPhones. Both phones come with 3D Touch and new 12-megapixel cameras, alongside Apple's A9 SoC that has proven to be one of the fastest SoCs currently on the market.