I make a test for 3 group of values.
3.Acceleration with gravity
On HTC HERO with android 2.1 got nothing.
On HTC Desire with android 2.2 got nothing ,too.
On iPad 1 (with iOS 4.3.1) got only the 3.
But on iPhone 4 (with iOS 5) all of them works well.
I think maybe I should upgrade my iPad and try again.:)