I have a similar problem with D2G with Europe GSM sim-cards..
Got the phone from States unlocked from vzw, plugged-in a local sim - no signal/no service. Although card is working normally in other phones.
Checked with 2 other operators - still zero result.
Rooted, installed Fission - same 0
SBF'ed to 2.4.29 - same, zero result.
Where else could you suggest looking at to fix the gsm networks working?
thanks in advance, Michael