Apple made available for download iOS 11.2.1 version to fix some bugs on iPhone and iPad.
iOS 11.2.1 fixes several bugs, especially a problem that could cause remote access to be disabled for users who share the use of the Home app.
The bug refers to a vulnerability discovered last week that allowed unauthorized access to smart accessories via HomeKit under certain circumstances. Apple had temporarily disabled, and via server, remote access now active again thanks to iOS 11.2.1 and the correction of that security flaw.
You can download iOS 11.2.1 OTA for free by heading to Settings> Software Update on iPhone.