I don't think I have ever gotten those popups on the mobile site. Perhaps it thought you clicked on one, and now wish to buy more spyware.
But, I get ads all over the place
The last time I was travelling and tried to use BF mobile, it was quite a bad experience to the point I just gave up. I don't remember everything, but I think it may have crashed the phone a couple of times, and was exceptionally slow.