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To see it in action, go to www.google.com using a cell phone or PDA, do a search for your keywords, and then click on one of your longer non-mobile (HTML) pages in the search results. GWT will reformat your page and translate it into the markup language your device uses, and you'll see the requests in your logs with the "Google Wireless Transcoder" user-agent.
If you are not seeing the GWT user-agent in your logs, then perhaps someone has copied the GWT URL from the search results and published it somewhere, and Google is now following that link.
Mozilla/5.0 (SymbianOS/9.2; U; Series60/3.1 NokiaE60/1.0; Profile/MIDP-2.0 Configuration/CLDC-1.1)
Interesting to see that telephone numbers are automatically detected and hyperlinked so that you can direct-dial the number right there from the website link.