Opera Mini, not the full Opera Mobile browser. Like on iOS, the loophole is that web pages are sent to Opera's servers for processing, therefore the app itself

Opera Mini, not the full Opera Mobile browser. Like on iOS, the loophole is that web pages are sent to Opera's servers for processing, therefore the app itself bypasses the restrictions on rendering engines. It's similar to mobile Chrome's "Data Saver" feature, or Turbo mode in the full Opera Mobile browser. Great for saving data, if you're on a limited connection. Would be nice if you could set it as the default browser on iOS or WP, too.