I have updated to version 2.2009.51-1.002 after my original post in this thread.
And "on" means (to me) that the unit is powered up.

Thanks, everybody, for this discussion.
It has been very helpful.

I do have another problem: when the phone is "on", and I push the power button, it does not always switch "off".
However, I'll call Nokia tech support, and if they can not resolve this, I'll ask this forum in a new thread.

Thanks again!!