High definition video and native video calling in Nexus S I try to compare Samsung Galaxy S with Nexus S.


May I know why video calling is not supported in Nexus S? Is it due to limitation in software or hardware?
May I know why high definition video is not supported in Nexus S? Is it due to limitation in software or hardware?
Where are you hearing this?  The Nexus S can absolutely support video chat, it has a front-facing camera.  Whether a video chat app supports the Nexus S is a different question.  Google Talk is supposed to support video chat in Honeycomb, hopefully it will be released for Gingerbread and support the Nexus S as well.

The Nexus S can't take HD video due to software restrictions, from everything I've read (example).  I think it just wasn't prioritized since the Nexus S is a "developer phone".  (If you meant to ask if it can play HD video the answer is yes, depending on the format and such).