I tried to flash the latest nightly of Carbon ROM tonight and I am having issues with activation now. I don't think it was the ROM but I'm not sure why it started happening all of a sudden. When it boots it just sits at waiting for network and never activates. I tried restoring a backup and it is also not able to connect to the network. I tried re-seating my SIM and it didn't seem to make a difference. I have removed it and I'm letting the phone sit for a while now. I will try again in a few minutes. I figured I would see if anyone else has run into something similar and might be able to save me some time playing with it.