Calls multiple times in a row...if you don't answer they just hang up.
If you answer the say they are from the US Grant Department When you engage them and tell them they are a scam they hang up.
I am tried of stupid scammers calling me at 7:00am 8:00am 9:00am. I am not stupid I don't answer my phone if the number is not in my contacts. I have gotten five different calls today from unknown caller ID's and 202-100-7100 just called me twice. I declined the second call. This all started at 7:00am today.