The official service life of any generation of iPhone is at least three years. If you start with iPhone 4, this number is four years. On all the lists, the current life expectancy is six years, namely, iOS 7- 12 for iPhone 5s and iOS 9- 14 for iPhone 6s/6s Plus/SE.
Ways to prolong the life of mobile phones:
1 The way to increase the life of a mobile phone is to increase its endurance. The battery of the mobile phone also determines the service life of the mobile phone. Apple mobile phone can only be used for 3 years. If there is something wrong with the battery, it is best to replace it with a new original battery.
The reason why the second mobile phone is stuck is because there is too much garbage in the mobile phone, so the mobile phone will be stuck. Therefore, in order to reduce the mobile phone card caused by insufficient memory, it is necessary to download some apps regularly to clean up the mobile phone software to slim down the mobile phone.