...
Our prototype should work on Android 2.3 ("Gingerbread"), but it also has backwards-compatibility enough to work on phones as far back as Android 2.1 ("Eclair"). You We also expect that it will be able to run up to Android 4.0 ("Ice Cream Sandwich"), but we haven't tested it much for that Android platform version. You should not need a large amount of free space to run our app's first test; having a few megabytes free should be far more than enough.
...