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There's no mention of sim unlocking here, unfortunately.

Sent from my Lumia 1520 using Tapatalk

You need to extract the file you got from the Google site as explained and flash using fastboot. It's in the steps provided. Though the file in the steps are for 4.1.1, you can still use it so you...

Edited for Jellybean 4.2.1

If you are stuck at ICS and would want to update to the latest Jellybean JOP40D for GSM Galaxy Nexus, here's a guide:

What's needed:
1. USB drivers - ....