Actually, I think it may still be from my old plan. I had it for the first five days of Feb, and it may have just rolled over from that. The old plans gave one free one a month until one amassed up to six, so that's most likely where it's from. I hadn't checked since the end of last month, I don't think.
Maybe I'm not so special. 😞
on the above page note the Token Bytes Available. 25 GB in this case
click on the token management link at upper right.
I have 1 500 MB Token available.
Click on the "use" button":
next we go back to this display
you may have to refresh the display by clicking on the refresh circle.
note that the available tokens have increased from 250000 MB to 255000 MB