What phone do you have?
AT&T in the philly burbs. where is everyone else at? Any non AT&T customers lose cell service?
Some people are reporting that OTA is causing issues while updating via iTunes works fine.
Go get it..
Edit 10:39 AM Pacific Time - Users are reporting that Touch ID and Cellular Service is broken with this update on iPhone 6 and iPhone 6 Plus. Hold off updating until further notice
Note that the no service issue isn't happening to all users... Caveat emptor on updating your device.