Even a used iPhone XS, which came out last year ... Narrator: Data from 2018 showed that the iPhone 6s and 7 are still very popular phones. And Apple is bringing iOS 13 to both of these phones.

Retailers indicate the price of a used digital camera has tripled over the last few years, and more people are selling outdated iPhone models such as the iPhone 6S in the hope of turning a profit.

Apple's new iPhone 6S is the best smartphone the company has made yet. It's a bit faster. It has a pressure sensitive screen. The camera is noticeably better in some ways. The design is more durable.