What is "10MB Vision Blkberry Pk"?

Now that there is more explicit billing, I keep seeing things
turn up on my invoice that I didn't previously know I had. Weird, but
typical of Sprint CS I suppose. There's no charge, but I'd like to
know what it is. Maybe I'd even use it!

I realize that I could call CS and ask, but I don't think I
need to explain why I'd rather not. The answers I get here are better
and more trustworthy.

Thanks in advance. DGI