while they're all different, like men (some are shy, some are scatterbrained, some play hard to get, people lose their phones etc) usually no response means they don't have much interest. women rarely have the courage to confront and prefer this passive route to rejecting potential suitors. unfortunately, this can happen even if they went out of their way to give you their number...
but don't panic. leave it a week then call and don't mention it. you're giving her a chance to get back to you, you're not appearing desperate and stalkerish, you're giving yourself another shot (people who barely know you can change their minds about you very suddenly, especially if you give them a reason to) and you're finding out one way or the other. i have regained the interest of a few women who ignored my first call.
after that if there's still no response, that is the response and yours should be to move on.