I realize that this is an old post, but did this problem get fixed?
I tried changing the last digit of the call forward number on my phone to "9", but the system says it's invalid and doesn't make the change.
But when I look at my actual usage, the four calls that showed to the "902" didn't seem to use any minutes.
Correct. On the limited minutes plans, the 3 forwarding options don't use minutes. The $10 plan uses minutes on the overall forwarding but I think iirc the $15 plan does not.