Your phone may be brand new, but your phone number likely isn't -- it probably belonged to someone else fairly recently. Of course, if numbers are being dialed randomly, none of this matters...
Umm idk if this is me but I went to a rock and worship roadshow tour date and texted in to win something they offered. I answered this call and it sounded like one of their promotions, just wondering if anyone else did the same....that might be how they got your number even if you are on a no call list.