Almost two weeks after Apple released iOS 17.2, Apple pushed iOS 17.2.1 to iPhone users earlier today. Apple said in the update log that "this update contains important bug fixes and addresses an issue where the battery drained faster than expected in some cases," which looks like a minor update, but iOS 17.3 could be in for a major upgrade. User updates to iOS 17.2.1 can be downloaded to eligible iphones via the Settings - General - Software Update. Separately, Apple is already testing iOS 17.3 and iPadOS 17.3, and these updates are expected to be released in January. 
Since the initial launch of iOS 17, users have said that there have been problems such as heat, Wi-Fi disconnection, screen burning, and random restart, resulting in abnormal battery life of the phone. Apple has since fixed these issues in iOS 17.1, but the experience is still not good. In the iOS 17.2 version of the system, there are still users reporting abnormal battery life performance, it is not yet known whether the latest version of the system really fixes the problem of power consumption too fast, which may have to experience a few more days to know. Can only say that every upgrade of the Apple system is its own bug, the old bug has not been repaired and new bugs, no wonder the installation rate of the new system is getting lower and lower. 
In addition to the above problems raised by most users, it is also very annoying in terms of details. Many users found that after the update of iOS 17, the mobile phone vibration feeling is not the same, there is no previous crisp shock, but a very loose and extended shock feeling, many users think that their mobile phones fail, in fact, because of the update of the new system before the problem, and this kind of vibration also want users to call can not stand, Users who are used to silence for years usually turn on the vibration, but such a shock really makes everyone feel uncomfortable, if the vibration is turned off and the ringtone is not turned on, it will lead to missing important information and calls, and turning off the vibration is not acceptable for a while. I hope that Apple can change back in iOS 17.3 after seeing so many people feedback on the vibration, and I really can't stand this kind of vibration like dropping the chain. 
It is worth mentioning that in order to encourage users to update the device operating system in a timely manner and ensure system security, Apple will close the verification channel of the old version of iOS after the release of the new version of the system to prevent users from downgrading to the previously insecure version. That said, users should think twice before upgrading iOS 17.2.1 and don't give yourself a hard time.
It was previously revealed that next year, Apple's focus in addition to the iPhone product line will be focused on iOS 18, introducing "major new features and designs", as well as major improvements in performance and security, which may be launched with the iPhone 16 series. 

 Apple's iOS has been rolling over in recent years, resulting in a continuous decline in the iOS update rate. According to the data, the installation rate of iOS 17 after 18 days of release is about 23%. For comparison, last year iOS 16 was installed 29 percent of the time within 18 days of its release, and 70 percent of eligible iphones were installed with iOS 12 two and a half months after its release. In the era of Apple's iOS 11, the installation rate on the first day can often reach more than 10%. The mobile phone generation is not as good as the generation, and the system is not as good as the version.

Finally, it is recommended that you turn off the button of automatic download system and automatic update, not only can you keep your own memory that is not rich, but also can save those annoying bugs, and the system is updated and more cherished.