okay, think. If you were Justin Bieber, and you had millions of girls constantly stalking you, would you just randomly give out your phone number? I wouldn't. Most likely, nobody but his closest friends and family members have his number.
not to be mean but no one knows it the only people he gives it out to is his friends and family he dont give his number out to fans bc he wont get any privacy he'll be getting txt and calls nonstop at night when hes trying to sleep sorry :)