I received a call from this number yesterday, I didn't answer it but was going to block it this morning and it did ring their number, I immediately hung up.
Have you recently interacted with any web site or service that you shared your personal cell phone number with? Bought things online, used social media sites (Facebook, Twitter, etc.), entered contests for prizes, filled out forms or surveys to get more info about something, etc.? Anytime you give out your contact information for something, there's a chance the entity you're giving your info to will sell it to others who, in turn, will use it to try to contact you.