On my 6600 the call diversion logo (a small tape recorder symbol) shows up and after every power on, its there again.
It came up while I set call diversion for all calls to voice mail for a trip to USA. After coming back, I cancelled the call divert, logo goes away, but: Switching off and on, the logo is there again, but the phone is reachable.
Bug, dump user or...?
Thanks
Wolfgang