I was never able to tether my 770 to my Sprint BB 8830. It would always say no services.
But I just updated the BlackBerry firmware today, and it said "no file transfer, just DUN"... Hmmm
So I set it up and I browsed from my 770 thru the 8830 to google.
Easy when it works. :-)

Of course, it's a work phone, so I have to be careful. I was told unlimited, but there's unlimited and unlimited. :-) It was never an issue because it never worked before.

Not that I expect to use it much. There's generally wifi where I am, but it's nice to know it can work.

desiv

p.s. OS2006