The Android version seems to work in much the same way as the Windows PC version. All you need to do is :
download and install the Android app via the hexcode site
make sure you have bluetooth connected on your android phone
pair it with the GS-911 (if you have a bluetooth version of course, which we fortunately did!)
Now fire up the app and the system and results are pretty much the same, but a lot more compact than having to carry a laptop or netbook round with you!
The screenshots below are from my HTC Desire:
1: Select the GS-911 app
2: Select series
3: select model
4: select system
5: select code type
6: ...and here's that ECU information again!
The GS-911 software is available for Java, Blackberry and Windows mobilephones - full details from the manufacturer's site.