I'm not sure if the issue was resolved with the OP (he didn't reply back). I have the same problem after CM 10.1 rom flash, I have data but no phone signal. I have flashed a TW rom to update PRL and profile, have done so several times with no avail. In the status section, the "Network" says searching for service, the "Service state" says out of service, user name is there, phone number is unknown, have MEID and IMEI and ICCID, PRL version is 1 even though I updated. Also, "activate this device" gets an error saying they experienced a system problem. Lastly, have re-flashed the modem just in case, again no change. Other than un-root and take it to Sprint, any other thoughts or something I can try to get my phone back?
Thanks.