Apple specifically lowers the speed of the previous iPhone models. About The Wall Street Journal writes, citing a statement by Apple
In the company explain this step “concern about users”. Apple representatives explained that the batteries in smartphones will eventually lose power. Because of this, their energy may not be enough, for example, at the time of using a smartphone in cold weather, in connection with which the device can be turned off.
To avoid this, Apple has made changes to the iOS operating system. This slows down the performing certain tasks if there is not enough resources.
Innovation is affected models of the iPhone 6, 6s and SE. IPhone 7 it will come with OS update.
“Our goal is to provide customers the best experience, including overall performance and a longer service life of the devices,” said Apple.