Hi, I'm trying to develop a USSD application from scratch but I'm not sure where to start. I have read the GSM specifications 02.90 and 03.90, I've searched for examples and I have found nothing usefull. I would like to know if there's a manual or something that can make the process easier. Can you program in any language, can it be with .net, or J2ME or can it only be done in Symbian C++? Is the software specific for a certain phone or is it the same for all? What else do I need? What do I have to give to the operator to make the application available? Is there an emulator I can use? Code samples maybe?
Please help, thank you in advance. Paola.