Why is the iPhone still smooth after three years of use, and some Android phones will change cards?

First of all, Apple's biggest advantage is its highly integrated and closed system. A handful of models every year means that iOS has very strong control over its own software and hardware. Although every evening show will be compared by friends, at least there is not much problem with the performance of a series every year. As the saying goes, if you work hard, you will be defeated! This is the advantage of hardware.

Secondly, the iOS side can only put applications on the appstore, so Apple's control over developers is still quite strong. The development is so bad that even the shops can't be put down. Especially games, even official website.

The third is that Apple does not do low-end, and Apple has only one brand, so the experience is very stable. To tell the truth, there are too many brands on Android, and each brand has high full price, medium and low end coverage. The worst thing is that the training of each system is different. Because the model is complex and the hardware is not uniform, it is difficult to adapt perfectly at the system level, and it is naturally difficult for the system to run smoothly for a long time.