Sorry to disturb you with this but I am really running out of solution...
My father gave me his blackberry Curve 8300 he bought in France with Bouygues provider. I am currently leaving in Vietnam using a local non blackberry GSM provider: Mobifone. I am still able to use Edge to have an internet connection through Opera Mini. My problem is that I decided to buy a quite expensive medical software and that the only solution to use it it to download it from my blackberry. Thus I have an internet link (.jad) to input in my blackberry browser. When I do that with Opera, it asks me the authorization to download through the Blackberry browser and obviously it doesn't work because I have no real data carrier in Vietnam... I have no idea how to solve my problem and get my software downloaded on my blackberry.
There is OTA Loader. It is a program that saves over-the-air jad files directly to the computer for install using the Desktop Manager. There is some controversy surrounding the program, however. Here is a link to a post that further explains everything: Blackberry OTA downloader. Good luck!