This has brought back Telstra 3G which uses 850mhz! However, I'm still unable to use Optus 3G which uses 900mhz! =[
I'm curious as to why 2100mhz refuses to work.
edit: Optus generally does 2100mhz in metro areas and 900mhz in regional areas which is what I'm in. This is why 2100mhz won't work. So there needs to be a 900mhz modem as well. This phone used to work on 3g 900mhz a long time ago...
How did you pull the dumps and compile them? I might try going through stock roms and extracting different modems until I can find one that will work for Optus.