I'm with Bell Canada and yeah, I figured they took the feature out. It's been quite a few months now since I posted this thread, and I actually tried all the ways possible to uploading a ringtone to my phone (except using the internet on the phone, which I don't plan to pay for and I doubt that would work anyways). In the end, these companies just want you to buy their ringtones, and not only are these ringtones not cheap, there's not too much of a good selection either.
Other than that, it's been 6 months since I bought my Rumour and I'm surviving without the customize your own ringtone feature...My phone's mostly on vibrate anyways.
Really sucks though that they pull out features from the phone, just to try to make better business profits. Oh well, business is business.