I use GTM with the mobile web application on my phone. I see the site pretty much the same as I would using my desktop PC, mostly...
Except where the GTM logo would normally be, up in the top left corner of the page, there is a button that reads "oyun oyna game" and it takes you to a page that is in some other language when you hit it.
What the Hell is this? I would assume it's some kind of advertisement, but it never changes.