Apple just rolled out its first update for iOS 8 with a bunch of bug fixes to resolve problems with third-party keyboards, HealthKit, and other features, but what Apple failed mention is that the update also knocks out your cellular connectivity and breaks Touch ID.
If you haven’t updated already, WAIT! It seems that the bugs might be just affecting users of the iPhone 6 and 6 Plus but we’ve reached out to Apple for confirmation.
In the meantime, if you’ve already upgraded to iOS 8.0.1 and want your cellular service back, here’s how to manually restore your device to iOS 8.0.
First disable Find My iPhone on your iPhone by going to Settings >> iCloud >> toggle off Find My iPhone. Then connect your device to a Mac, open iTunes and follow these steps.
1. Download iOS 8.0 (You can find a list here)
2. Open the iPhone page on iTunes.
3. Hold Option and click Restore iPhone
4. Select the iOS 8 IPSW firmware you just downloaded.
5. Click Restore and wait for iTunes to work it’s wonders.
The entire process shouldn’t take longer than 30 minutes.