Is there an Android device that realtime shadows work on?

To answer my own question: There are many Android devices that can use realtime shadows! - but if you have your quality settings correctly configured :-P

(Narv's comment made me take a closer look at how the quality settings are set - embarrassingly, mine were set to something that didn't support shadows, despite my best intentions... )

Here's how to select the right settings:

1) Decide which of the preset Quality Levels suits what you're trying to do by clicking through the list 'Fastest, Fast, Simple, Good.. etc' and looking through the details in the panel below..

2) Once you've decided, click the black 'default' triangle underneath the platform you're targeting - so in this case the 4th triangle along - and select which Level you would like to use...

3) Done.

Remember - on Android, you must be using Unity 4 Pro + Android Pro, this doesn't work with the free version of Unity... Also devices with Tegra GPUs (e.g. Nexus 7) can't render Unity's realtime shadows

Now, as Embarrassing as that is that i've made this mistake, its worth commenting commenting that this UI whole widget is incredibly confusing and difficult to use. I've done a quick study of the UI designers in my studio: no-one could figure it out at first glance. So i guess that's a relief for me, at least perhaps i'm not as stupid as I initially thought ;-)