Installing iOS 12.1.2 might break cellular data, calling, and messaging TechSpot
Last week Apple released iOS 12.1.2 for the iPhone, but had some trouble along the way. Just days after releasing the initial build, a second build was pushed out to replace the first, changing only the build number, not incrementing the well recognized version number.
from TechSpot http://bit.ly/2EI9fkA
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