Today Apple has released the iOS 8.0.1 update that was intended to fix many issues with iOS 8. However the update is bricking the majority of devices. It's cutting network signal for a lot of people and breaking the Touch ID fingerprint scanner too.
Please do not update your device until apple has resolved these issues.
If you have updated, don't worry! People have mentioned that a restore will fix this right away. However a restore will also wipe your device!
If you need assistance don't hesitate to contact us on 01792 732401 or firstname.lastname@example.org