Apple’s iOS 12.1.2 update is causing problems for some iPhone, iPad, and iPod touch owners.

The iOS 12.1.2 update fixes several lingering iOS 12 bugs, but some users are running into trouble with the latest version of the operating system.

iPhone, iPad, and iPod touch users are running into installation issues, abnormal battery drain, connectivity issues, and problems with Face ID and Touch ID. These are all common problems and most of them can be fixed in minutes.
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https://www.gottabemobile.com/ios-12-problems-5-things-you-need-to-know/