Yeah - not to hurt your feelings or anything but if I had to guess, he's not going to call because you hooked up so quickly. He probably asked for your number to be polite but, realistically, it's not going to turn into anything else. At best, he'll call when he's looking to hook up again.

No judgment or anything, but if you're looking for a lasting relationship, I would recommend waiting for at least a monogamous committed relationship before any kind of sex. It's just the way it works the majority of the time.