[c0011j]

Get your MSL and do a ##RTN# (##786#). If you have already done a hard reset than that would be the last thing I could think of. That will wipe the phone storage and network settings off the phone. When it comes back up you will go through Hands Free activation.
if this is stock rom as you said. If you do this with a custom rom u will have to reflash to stock after the RTN then back custom.