OMG WHAT SHUD I DO IM SO SCARED?

ok well i just got a new cell phone its my first one so i wuz really exxcited n stuff i wuz texting my friends n stuff n all of a sudden my phone rang n like insted of a # showin up it said RESTRICTED what does that mean?????? R ALIENZ TRYN TO CALL ME!?!??!?!?! SHOULD I TELL THE FBI?!! i meen how can a # juz be restricted!!!! im scared maybe someone is tryn 2 stalk me without me knowin who it is!!!!!!! WHAT SHUD I DO PLZ HELLP ME