Turning off cell broadcast messages in Ice Cream Sandwich
After some investigation and asking around, I have been told that these settings might be under Settings -&gt; Call -&gt; Other Call Settings, and indeed they were.

However, the owner of both a stock Samsung Galaxy S3 and an ICS updated Galaxy S2 told me that those two had the CB settings under Messages -&gt; Settings.

I have not been able to find out which one of these two the default location is. It is possible that HTC has moved them.

What I have found out is that other manufacturers (Sony is one example I've come accross) are also placing CB settings under general settings rather than messaging settings, so there might not be a one-size-fits-all answer for this question.