Normally a .01 release is intended to provide bug fix relief discovered by early adopters. Apple is in big scramble mode as iOS version 8.01 appears to torpedo not only cellular service, but touch ID and the new health app as well. While Apple expects to have this fixed with 8.02 in the coming days, the good news is that a work around exists to restore iOS 8 via iTunes. Instructrions can be found on Apple’s web site. http://support.apple.com/kb/HT6487?viewlocale=en_US&locale=en_US

iOS 8 restore workaround from Apple