A few hours back Apple released iOS 8.0.1. This is purely an incremental update that was meant to fix some bugs, instead what it ended up doing was far worse. Soon after people started installing iOS 8.0.1 on their devices iPhone owners found that the update was killing cell service on their devices. Even the Touch ID fingerprint sensor stopped working, this behavior was noticed on iPhone 6 and iPhone 6 Plus as well. Fortunately there is a method to downgrade iOS 8.0.1 to iOS 8 so that you can recover cell service.
Apple has taken note of the issues that its latest software update has caused. The update has been removed from the Developer Portal and it is no longer being rolled out to users over-the-air.
This means that iOS 8.0.1 has been pulled from the company’s services. In that case its very easy to downgrade iOS 8.0.1 to iOS 8. Simply hook up your iPhone to a PC and then restore the software via iTunes. It’ll revert you back to iOS 8 since that’s now the latest software version available on Apple’s servers.
Before you do that though make sure to create a backup of all the data on your iPhone, you will be able to do that via iTunes as well. Once the new software is installed and all of your apps and content is back where it belongs, the iPhone will restart once before it recovers cell service and Touch ID.