It really depends on the guy it might mean a few things. One could be that he is not interested second he might not want to come on to strong and third he might be real shy and not know what to talk about. Maybe you should just call him and ask him. That is of course if you are interested in him.
Well some guys just don't like talking on the phone thats why he wont call..... Its not that he isn't interested ... Or maybe he just isn't interested but you should be able to tell by the way he acts if hes interested or not.