The iPhone 6S was released in September 2015. It broke Apple’s record by selling 13 million phones on the opening weekend, beating the iPhone 6 which sold 10 million units on opening weekend
It became Apple’s flagship phone as soon as it was released.
A used iPhone 6S’ price averages around R4,000 - R4,500. A new one in 2016 averaged around R12,000 - 15,000, making a used model almost 60% cheaper
It has a good resale value depending on its condition, it’s able to maintain 40-60% of its value if its sold within a year to two years