RTCIceCandidate instance cannot be created in browsers on moblie devices

I'm recently trying some awesome features of HTML5 and WebRTC, and am building a site to allow multiple people video chat.

Everything works just fine on my PC and the Media Capture of HTML5 works like a charm. But when I set up a video source on my PC, and try to connect to it via my android/iphone/ipad, it just did not work. I checked the logs, it suggests that the creation of RTCIceCandidate failed for some unknown reason:

// To be processed as either Client or Server
case "CANDIDATE":
    trace("************important*********", "we get in");
    var candidate = new RTCIceCandidate({candidate: msg.candidate});
    trace("************important*********", JSON.stringify(candidate));
break;

turns out the second log never shows up.

Anyone has any idea? Is is because such features are not available on mobile devices for now? Or should I do something specially for mobile devices?

oh and this is the callback of IceCandidatem which is never called:

// This function sends candidates to the remote peer, via the node server
var onIceCandidate = function(event) {
    if (event.candidate) {

       trace("openChannel","Sending ICE candidate to remote peer : " +  event.candidate.candidate);
       var msgCANDIDATE = {};
       msgCANDIDATE.msg_type  = 'CANDIDATE';
       msgCANDIDATE.candidate = event.candidate.candidate;
       msgCANDIDATE.peer = server;
       msgCANDIDATE.me = weAreActingAs;
       //trace("openChannel","candidate peer : " + JSON.stringify(event));
       socket.send(JSON.stringify(msgCANDIDATE));

    } else {
       trace("onIceCandidate","End of candidates");
    }
}

The server is in nodejs.

Thanks so much guys! Need your hands!