It's possible that you have a newer phone, and that unlocking your bootloader causes no network.
Well the version I have is 11w20 and looked at the guide for it and this is from what i read fine to unlock loader as this works fine on other custom roms
Baseband:015
Followed the guidance off this http://xdaforums.com/showthread.php?t=1481630
The phones affected by the problem are units being manufactured at, and after, 11W29!
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