No way to do it as far as I know. Can't even think of a work around. You could try and start the name with a *, #, or _ but this won't be supported and will probably cause problems on the system. If you want to try it then go for it but don't be surprised if you have problems. It would still show up if someone enter one of those characters from the phone as the first character. Even this will show up in the Phone Manager directory. There's no way to truely hide it like you can with a User.