Based on this thread, I'm able to create app that read response of USSD Code.
I already test it with my Photon, unlocked bootloader, CM7 Rom with several telecommunication provider in my country.
- Download and install app
- After finish install, RESTART your phone once.
- Application ready to use
Let me know if this working or not with other rom, also if you have experience or problem with this app you can also post it here.