Apple pulled the iOS 8.0.1 update from availability, a fix is likely incoming. For now, it appears to only affect iPhone 6 and iPhone 6 Plus users. An Apple spokesperson provided us with the following statement: “We have received reports of an issue with the iOS 8.0.1 update. We are actively investigating these reports and will provide information as quickly as we can. In the meantime we have pulled back the iOS 8.0.1 update.” If you’re a victim of the buggy update, restoring your iPhone via iTunes appears to revert back to iOS 8.0, enabling service again. Many users of iPhone 6 and 6 Plus, myself included, are seeing cell service knocked out by this update, and Touch ID also seems to not be recognized. It could also be a factor of doing an over-the-air update, as some phones which updated using the tethered version via iTunes are apparently working. Hold off on updating any iPhone models until this gets sorted out, just to be safe.
Did you update your device and now can’t fix it? The Next Web has details how to revert to iOS 8.0.