hb11? oh my... if 10 is perfect how could there be an 11?
anyway... i'm just picky...
what are the circumstances? how long has he known her? what have they done so far? etc...
there is no magic pill that will just get him a phone number but if he has been playing it right from the start, then maybe he could pull something off. have you read any material like the mystery method? follow this as a guide. if you need help ask us about the specifics in the method instead of "how do you pick up a girl" lol
gl to your buddy though. if it doesnt come out, at least he has a cool story about he hung out with some hot singer. not every guy can say that!