I've just Hard reseted my 6600, when I restored the phone and memory card, I've discovered that the present voice commands did not work, can't be changed, and could not be deleted either, all I can do now is add new voice commands. Another strange thing is when I playback the present voice commands I just get a blank sound for less than a second. Any attempt to delete a command (so that I can start over) I get a "voice command system error" message. I hope any expert out there can help me out, voice commands really help me out when driving on the highway.
Voice commands problem
I am experiencing the exact same problem.
Try formatting the phone using the following steps.
Hold the Green Answer Key & * & the 3 key, then power up the unit. Make sure that the battery is fully charged before you do this.
Other than that it sounds like a visit to your local CNSP for a re-flash.
Please let us know of the out come.