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How to unlock Iphone 3g iphone OS 3.1.3 model:MB048LL Firmware: 05.12.01?

mb2009 asked
Last Modified: 2012-05-09
I had iphone os 3.1.2 jailbroken and unlocked. But my phone crashed last week and I end up updating to os 3.1.3. But I had no success in unlocking. I tried downgrading to OS 3.1.2 (using itunes method, redmond..), but phone crashed in unlocking or booting. I could only restore it to 3.1.3 version. I searched everyplace  for unlock for OS 3.1.3 and my new bootram (MB048LL), but could not find any. My phone is really useless now since I have tmobile service. Please advice.
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