Apple released iOS 12.1.2, a minor patch designed to fix problems with eSIM support on the iPhone XR, XS, and XS Max, as well as cellular connectivity with those phones in Turkey.
Apple does say that the update includes bug fixes for eSIM activation on iPhone XR, XS, and XS Max. The company also highlights that the update resolves an issue affecting cellular connectivity in Turkey for the same devices .
Fixes bugs with eSIM activation for iPhone XR, iPhone XS, and iPhone XS Max
Addresses an issue that could affect cellular connectivity in Turkey for iPhone XR, iPhone XS, and iPhone XS Max
Though it’s as yet unknown, the update may also address Qualcomm patent violations in China. Last week Apple promised some form of software update which would allow Apple to legally continue iPhone sales in the country.
Following the release of iOS 12.1.2 , Apple today has stopped signing iOS 12.1. This means that downgrades to iOS 12.1 are no longer possible, though you can still downgrade from iOS 12.1.2 to iOS 12.1.1.