I just updated my iPhone 5 with iOS 6.0.2. I had no problems in updating, but found out that all of my text messages last the name of my contact and substituted the phone number instead. Also, all of my recent phone calls did the same thing. I did notice that one call made after the update for a new contact I added showed the person's name.
My question is whether or not this lost of name information pertains to past activities only. Is there any way of retrieving names for text message threads? I have long threads with particular contacts and would like to maintain them. If they remain only as phone numbers, I may need to delete them and start new ones.