Sorry your still having this issue.
Ive googled and found nothing consistent apart from the obvious that already been mentioned.
Daft question i know but, are you absolutley 100% certain that this phone has not been blocked by your network via IMEI?
Sounds daft i know but people using phone / Tablets are reporting on consisten problems with networks and IMEI.
I would not attempt QDL anymore, if it didnt fix it the first time then that wont help your cause.
I think going back to ground zero is the place to sart, can you gain access to internal memory card, mine i can, i cut away the piece of plastic in the guide to allow easy access, i replaced the internal 2gig card with an 8gig class 10, just to note, the 2gig card was shot and was nothing more than a standard generic unbranded card, i do still have it sat around.
That would be my next step, wipe the phone, stick a diff card in and start again with STOCK 360 and matching recovery, i agree with the quote of avoiding gs, too damn buggy and problematic.
Let me know how youre getting on with it.