Scam-the Government does not randomly call people and award them thousands of dollar because they are a good citizen, pays their bills on time, mows their lawn every 5 days or brushes their teeth 3 times a day. To receive a grant there is a strict process that must be followed. In addition, these clowns will have you pay an acquisition fee (maybe $250.00 or so). So they get your money and you get taken to the cleaners (you get no money). There is no free lunch, no free money and the only free cheese is in the mouse trap. Do not call them.
This is a B.S. CALL. I have received calls from this number for two days. They never leave a message. I answered earlier today and, with a very thick foreign accent, asked for me by first name. When I asked what he wanted, he hung up. I just received another call from 202-431-4853 and my caller ID says it's from Lewis Tuck HOWEVER, this same guy with the thick accent said his name was James and he was from the Federal Government Grant Money Department with a once in a lifetime offer for me. He wanted to tell me all about it so I told him I wanted every single detail. When he started, I very quietly hung up. I bet he's still talking.
Do you have a website you are hosting? (like through hostgator or something, with non-private hosting)? They could be getting your phone number through there if that is the case. I use a special phone number to avoid this. Or did you make an online purchase lately? Sometimes they sell your information.