Who called from 2122119000

This number call every day and i dont answer

i did not answer the call, but what really makes me wonder is, how do they know my cel number? ´cause mine is private.

About 22 days ago I received calls from this number and do not know how they know my phone number, the most unusual is that this numerto is New York of the United States and not conosco anyone there so I do not answer because it can be a fraud. Be careful.