Do versions of android varies from manufacturer?
<p>I'm very curius about one thing:</p>

<p>Is it possible that for instance, Jelly Bean on HTC differs from Jelly Bean on Samsung, or Sony, Motorola..etc? If "YES" why?</p>

<p>Actually this IS programming question because, some apps that i'm testing are working on HTC, but not (not fully working, or with "bugs" ) on Samsung, or vice versa.</p>
