There have been some Jelly Bean updates for Galaxy Nexus, but most of these are specific to a certain variant of the Nexus. How can I easily find out which variant I have?
There used to be an app that did just this, but it's been pulled for some reason. You could also download a "system info" type app, but these often come with ads and other bloatware.
The easiest way is to download a terminal app such as Android Terminal Emulator, open it and run the command
Here's an example what the run looks like:
... and there you have it, takju!
Another way would be to open